UNIVERSITY OF CALIFORNIA PUBLICATIONS COLLEGE OF AGRICULTURE AGRICULTURAL EXPERIMENT STATION BERKELEY, CALIFORNIA PRELIMINARY YIELD TABLES FOR SECOND-GROWTH REDWOOD BY DONALD BRUCE BULLETIN No. 361 May, 1923 UNIVERSITY OF CALIFORNIA PRESS BERKELEY 1923 David P. Barrows, President of the University. EXPERIMENT STATION STAFF HEADS OF DIVISIONS Thomas Forsyth Hunt, Dean. Edward J. Wickson, Horticulture (Emeritus). , Director of Resident Instruction. C. M. Haring, Veterinary Science, Director of Agricultural Experiment Station. B. H. Crocheron, Director of Agricultural Extension. C. B. Hutchison, Plant Breeding, Director of the Branch of the College of Agriculture, Davis. H. J. Webber, Sub-tropical Horticulture, Director of Citrus Experiment Station. William A. Setchell, Botany. Myer E. Jaffa, Nutrition. Ralph E. Smith, Plant Pathology. John W. Gilmore, Agronomy. Charles F. Shaw, Soil Technology. John W. Gregg, Landscape Gardening and Floriculture. Frederic T. Bioletti, Viticulture and Fruit Products. Warren T. Clarke, Agricultural Extension. Ernest B. Babcock, Genetics. Gordon H. True, Animal Husbandry. James T. Barrett, Plant Pathology. Walter Mulford, Forestry. W. P. Kelley, Agricultural Chemistry. H. J. Quayle, Entomology. Elwood Mead, Rural Institutions. H. S. Reed, Plant Physiology. L. D. Batchelor, Orchard Management. W. L. Howard, Pomology. 'Frank Adams, Irrigation Investigations. C. L. Roadhouse, Dairy Industry. R. L. Adams, Farm Management. W. B. Herms, Entomology and Parasitology. John E. Dougherty, Poultry Husbandry. D. R. Hoagland, Plant Nutrition. G. H. Hart, Veterinary Science. L. J. Fletcher, Agricultural Engineering. Edwin C. Voorhies, Assistant to the Dean. DIVISION OF FORESTRY Walter Mulford Arthur W. Sampson Donald Bruce Emanuel Fritz Woodbridge Metcalf Francis X. Schumacher * In cooperation with Division of Agricultural Engineering, Bureau of Public Roads, U. S. Department of Agriculture. PRELIMINARY YIELD TABLES FOR SECOND- GROWTH REDWOOD By DONALD BKUCE The owner of timberland who is contemplating or attempting the placing of his holdings under a plan of forest management needs certain basic facts for his guidance. Among the most difficult of these facts to determine is the rate of growth which may be expected in the second growth stands on the cutover lands. Without informa- tion on this point the timber owner will be unable to determine whether his second crop will be of merchantable size and ready for cutting by the time he has exhausted his reserves of virgin timber, or whether it will be sufficient in quantity to supply his existing manufacturing plant. Without this information he will be unable to judge the financial expediency of various forestry measures. Precise answers to questions involving future rates of growth are impossible, but reasonably reliable figures can be predicted with the aid of what are known as yield tables. This bulletin presents preliminary tables of this sort for redwood (Sequoia sempervirens Endl.). The tables are termed preliminary, partly because the values given in them will probably require minor modification when a larger mass of data has been secured, but more particularly because they do not deal with stands over 60 years of age and do not, as will be later explained, cover the poorest growing conditions. Furthermore, they give no detailed information concerning the effect of introducing other species into the redwood stands. They are published in this tentative form because they will answer with all essential accuracy many of the immediate questions of redwood forestry. Note. — Mr. F. X. Schumacher of this University gathered a large part of the basic data for the tables and performed much of the computational work. Mr. V. B. Davis, Forester of the Union Lumber Company, and Mr. M. E. Krueger, Forest Engineer of the Pacific Lumber Company each con- tributed a considerable number of valuable data. Professor W. Metcalf and Professor E. Fritz of this university, and Mr. R. E. Burton of Santa Cruz assisted with additional material. To these men and to Major D. T. Mason, Forest Engineer, who has helped in many ways, appreciative thanks are extended. 426 UNIVERSITY OF CALIFORNIA — EXPERIMENT STATION DEFINITION OF YIELD TABLE These yield tables state the amount of timber, together with its size, which can under good management be raised on lands of varying degrees of productivity. Two types of yield tables are recognized, normal yield tables which state the production possible under ideal conditions of stand establishment and care, and empirical yield tables which state the production actually occurring under existing condi- tions. In the case of redwood, empirical tables would predict how much timber will grow if no attempt is made either to secure proper stocking of the cutover lands with young trees, or to protect the land from fire. Normal tables, on the other hand, predict the result of securing full stocking by replanting 1 or other means, and then of properly caring for it until it is mature. Empirical tables are of little value, since existing conditions may be profoundly modified, as for example, through systematic fire protection, within a few years' time. The tables presented in this bulletin are of the other type, but do not contemplate intensive care, as for instance, properly conducted thin- nings, which should materially increase the yield. The tables, moreover, do not contain information concerning the quality of lumber which will be produced. An investigation of this phase of the problem is now being conducted. EXPLANATION OF YIELD TABLES The following explanations are necessary for the proper interpreta- tion of the columns of the yield tables herewith presented and should be referred to in connection with pages 428-430. Site. — In accordance with a well established forestry practice, red- wood producing lands may be divided on the basis of their relative productive capacities (resulting from differences in climatic and soil conditions) into five classes known as site classes. Site I includes the most productive and site V the least productive areas. Although five divisions are recognized, tables are presented here for sites I, II, and III only, since adequate data on sites IV and V have not been secured. It is probable that the two lower sites lie chiefly toward the southern limit of the range of redwood and occur but rarely in the region of its optimum growth. They are therefore of little interest to redwood lumbermen. Site I, moreover, probably occurs on but a small percentage of the area of the redwood region, and a large part i Sprouts develop with great vigor and profusion about recently cut stumps, but they arc ho poorly distributed that only a few are able to survive. In one instance it has been estimated that sprouts will stock the area to but about 25 per cent of its capacity. Bulletin 361] yield tables for second-growth redwood 427 of such Site I land as now exists may ultimately be used for agri- culture, so that most of the land on which redwood timber will be raised in the near future falls into site classes II and III. How the site of any given tract may be determined is explained on pages 433-436. Age. — Age should be figured from the time of logging the previous stand. It is true that when young trees are planted they may have had a start of 1, 2, or 3 years in the nursery, but on account of the setback which they receive on being transplanted, this advance growth should be disregarded. Number of Trees Per Acre. — Under this heading two figures are given: (1) the number of all trees, and (2) that of the dominants and codominants. By 'all trees' is meant all over 2.6 inches in diame- ter when measured outside the bark at a height of 4.5 feet ('breast high') above the ground. This designation obviously includes practi- cally all living trees except in the case of very young stands. The more significant figure is the number per acre of the larger trees, since these include nearly all the trees of potential economic value and since their volume constitutes some 80 per cent of the stand. The dominants and codominants are those trees the crowns of which form the general level of the forest canopy or extend above it. They are so named in contrast to the intermediate and overtopped trees. Both figures are only approximate, as the data obtained were very variable for reasons which are explained under 'Basal Area.' Average Height. 2 — The height is measured from the average ground level to the tip of the tree. Average D. B. II. — By d.b.h. is meant diameter breast high, or the diameter measured outside the bark 4.5 feet above the ground, a point which, since it is above the root swelling, and is conveniently reached, has become accepted as standard for studies such as this. As in the case of average height, an average d.b.h. 3 value is given for all trees, and for the dominants and codominants only. Basal Area. — By basal area is meant the sum of the cross-section areas in square feet, measured 4.5 feet from the ground, of all the trees on an average acre. Since it is calculated from the d.b.h. measure- ments it includes both wood and bark. Its significance lies in the fact that it is a value which has been found relatively insensitive to variations in stocking. An increase in the number of trees per acre results in a decrease in their average diameter, and vice versa, but unless the overcrowding or understocking is pronounced, the basal area for a given tract of land will not be much affected thereby. 2 The "average height" is that of a tree of average basal area; see page 442. 3 The ' ' average d.b.h. ' ' is that of a tree of average basal area. 428 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION i— i m oT o o is Q H O H H Q - s OS o u 03 o » o lO »o ^ CD CO (M 1—1 CD =3 5 oS i—i OS OS CO 00 CO ^ T3^> o o O O o o o »o o la S"S c^ !N OS o CO >o (N CO 1— 1 s Org oo CO CO OS i—i CO CO CO CO CO CO CO CO CO t- • CJ "2 Logs pe MJB.M for Avoragi Domi- nant an Co- domi- nant t^ r^ to oo IK O 02 CM (M CO co CO co CO CO co i< -r CJ u m oo t> 50 — S ■- - o3 i) Oi r^ o o o IO CO rjM CO PQ 3 £ ■3 a C5 lO o CO iO CO l> oo oo Eh 73 (N CO •<* TJ( Th TjH TjH T]H -* -+-> 0) 5 00 0} 00 H c -»-> A § 03 CO 00 OS 1— 1 r— ( A 5 5 s - o.h o 3 So 1 to lO CO CO o to CO to oo CO -# 00 CO o 1^ to Tt< CO H « tP co (N H BULLETIN 361] YIELD TABLES FOR SECOND-GROWTH REDWOOD 429 >-. .9.8 2 CO »o 1> to t> o o 1> -* SSU2 i-H i-H to S3 Oh 2 Board Foot Cubic Foot Ratio IO 1—1 CO co o tO to to OS CO to CO CO Tl o o o o o o o o o c3 ^ JJ t^ oo to (M o CO o CO o -6 "*-' a v co 00 CO tO lr^ oo OS OS CS V o Eh go < 3r° &H lO < H M.i, 3 J^ o ^ c -u ° s 3 ■< s CO 00 ir^ o CO co i-H o OS to CO (N oj 3 is a c -3 U) o 3 0) 1-H 1^ OS J— 1 CO ° .3 = 5 c © S 1—1 O .3 o OS T— 1 T^ ~- H 3 < p— i ■<-> s 1—1 o +3 OS o i—l o o o OS oo CO cd TtH CO 1> oo os o o i-H to co o *l 0) ^ iO CO I> t^ 00 OS o i-H CD fa i-H i-H 1 13 o o 00 o ITj CO to d o o o (M t^ (N OS t^ CO to (-r »o Tj) CO CO «# 00 oo CO o i^ «*l 3 OS l> CO »o 'HH -^ T" co CO o o »o o to o to o to o << 03 H H Eh h-C m a o o a « o H O < « o 55 H < 430 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION fa H m 'a o o Q fa « O fa fa 5 fa o CO fa 5 Basis Number of Plots oocoeocoo^o co 1— 1 T-^.2^ 2 u* <^ rr /-n '^* §r° 3 r5^ eooiai-icoocoio cqcoTtHtoiocococo "o3 a G-G < DO o s Eh pq-H oooooooo C^OOTticoirjcocDiO O 1 ^ OOOCO^OOcOOOO Logs per M.B.M. for Average Domi- nant and Co- domi- nant r^^ioOOOiOCOCSI Tt a CO O H O 13000 26500 40000 53100 65400 76300 85800 93000 _C CD 4200 5700 7300 8900 10400 11700 12800 13700 14400 c3 05 Q, £ g*2 o.£ o =3 SO £ o3 3 r C r^(Nr^OO(N(MOOO^ OiOOOOfNCOT^T^iO (N(N(NCOCOCOCOCOCO in 3fa m cococoi— io < JL 5 "G -^-^ 1 » £ c^ a * Sn'3 Q G ^^ £ -0 co V -G 00 OOOTFOCOiOtOCO O 1— icoiocor^ooo CO — ■ co 3 -G O G C5 CD r^i— icqi-HOit>c0O5 OOOr-ic C0t*t-O005©0 1— 1 T-H co -1-3 V fa OOI^TtHtMOr^r^i-ioO co-^Hiocor^i>00O5O5 V E f-c o «*- ej °< -3 « £ a 3 'G * i _« 1 «3 * 5n G O G =3^ £ -3 OCOCOOOCO 16.6 U7.8 88 92 96 < 100 103 > 28.3 105 108 no' 112 114 - 29.01 116 118 < 119 120 121 > 18.2 ^52.2 122 123 124' 125 > 5.0 125 THE APPLICATION OF THE TABLES Site Determination. — To apply these tables to a concrete problem requires, first of all, a more or less intensive field examination of the cut-over land in question in order to permit its classification into site classes, and a determination of the number of acres available in each. This can best be done by a sampling process in which the 434 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION site is determined at a number of points scattered throughout the tract. If the site numbers are then entered on a map (preferably one showing the topography by means of contours), zone lines indi- cating the approximate limits of the classes present can be drawn, and the area of each site computed in any convenient manner. Too great refinement is probably not justifiable in this work, and the method of locating the samples will depend on the degree of accur- acy sought and on other practical considerations involved in each particular case. The method of determining the site for a specific sample must, however, be understood. There are two alternative plans possible. The first involves laying out sample plots similar to those which form the basis for the yield tables. If this method (described fully on page 442) is followed the age of the existing stand and the average height of its dominant and codominant trees are first determined. The values obtained should then be plotted on figure 1, page 435, by entering a small cross vertically above the determined age and horizontally opposite the calculated average height. It will be observed that the figure is divided by curves into 5 zones, each allotted to a given site class. The zone in which the cross falls is the site class of the sample investigated. While the method just described is the more accurate, it is laborious and will often prove too expensive. Moreover, most of the cut-over land existing today is not fully stocked, and in such stands it is sometimes difficult to decide what trees should be classified as dominants and codominants. In many cases, therefore, another method is preferable. The second process consists of determining the age of each stand and then measuring the height of the tallest tree in each of several well defined clumps of sprouts and computing the average. (Stunted or otherwise abnormal clumps should not be included.) The resulting average should be reduced by 6 per cent, 9 and the result entered on figure 1 as before. This rule applies, however, only to stands which are fairly well stocked. In very open stands it has been found that the clumps of sprouts do not reach their normal height. 10 In such cases a correc- tion for density should be made by adding 13 per cent to the average height obtained. Where the two corrections are both required they may be combined and 6 per cent added; (.94X1.13 = 1.06). If a factor of conservatism is desired in classifying the site this correction may be ignored. 9 The statistical basis for this figure is given on page 447. io This statement is in conflict with the theories of some writers, but the evidence for it seems conclusive. See pages 447-449. BULLETIN 361] yiELD TABLES FOR SECOND-GROWTH REDWOOD 435 © © - = B o O Q ^ Site I [ Site II •Site III }■ Site IV !►«,- Site V 5 10 15 20 25 30 35 40 45 50 55 60 Age in Years. Fig. 1 — Height Curves Used in Determining Site. 436 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION In some instances stands will be encountered in which such species as Douglas fir, white fir, or Sitka spruce, are predominant, and redwood is not present in sufficient amounts to make the pro- cedure just described practicable. In such a case the former alter- native must be adopted and the average height of the dominant and codominant tree of the principal species should be determined. Since all three of the species mentioned above are taller than red- wood at the ages dealt with in the yield table, it is then necessary to apply a reduction factor to this value. This factor is 16 per cent for Douglas fir and white fir and 20 per cent for spruce. 11 The modified value thus obtained is the approximate average height which would have been attained by dominant and codominant redwoods on the same soil, and may therefore be plotted in figure 1 as previously described. The use of associated species in this manner to determine site class cannot be considered rigorously accurate and the method should never be used except in the case of land which is obviously suited to the growth of redwood. Where redwood, fir, and spruce are all present in considerable numbers it is well to strengthen the accuracy of the site classification by using each species in turn and averaging the results. Determination of Stocking Factors. — By some one of the fore- going methods the number of acres of land of each site class on a given tract may be determined. These values multiplied by the appropriate values selected from the yield tables will give the produc- tive capacity of the tract. It is improbable, however, that the full amount of timber thus estimated can actually be obtained. Sprouts alone will probably never result in full stocking, and even under the best possible conditions and with the best care that is economi- cally justifiable, there will be some failures in the replanting of the cut-over lands, some damage from fire during the life of the stand, some defect found in the final product, and some unavoidable break- age in felling, etc. Just how much will be lost from all these causes can only be conjectured, since experience to guide us in our estimates is of course as yet entirely lacking. It seems probable, however, that conservative timber owners will wish to discount the final yield by at least 10 to 20 per cent. In the case of second growth stands already established, and where planting is impracticable, a far heavier reduction figure will usually be necessary. Such stands are rarely fully stocked and may be very scantily stocked. In such instances it will be necessary to 11 See pages 449-450 for the statistical basis for these figures. BULLETIN 361] YIELD TABLES FOR SECOND-GROWTH REDWOOD 437 determine the per cent of stocking now on the ground. This may be effected by a sampling process, representative strips or plots being laid out and the trees therein carefully measured and recorded. The basal area per acre should then be computed and compared with that given in the yield table for stands of the same age and site, the ratio between the two figures being the stocking factor. The final yield for the given site should then be reduced by multiplying it by this factor. It should be noted that this procedure gives some- what conservative results, since the fact is well established that where existing trees are well distributed the stocking factor improves with age. This increase will tend to compensate for the reduced height growth in open stands. AN ILLUSTRATIVE EXAMPLE OF THE USE OF THE TABLES The various steps described above may be better understood in connection with the following hypothetical computation. Assume a tract of 1500 acres which on examination is found to be sub-divided as follows: Virgin timber on river flats 200 acres 35-year-old second growth on river flats 300 acres Virgin timber on uniform easterly slopes 600 acres 25-year-old second growth on similar slopes 400 acres Total 1,500 acres The average height of the tallest tree in each of a considerable number of clumps of redwood sprouts on the river flats is found to be 81 feet. Since the stand is very open this is increased by 6 per cent (see page 434), thus becoming 86 feet. This value plotted on figure 1 over an age of 35 years indicates the site class of the river flat to be II. The 200 acres of virgin timber is assumed to stand on a similar site. The slopes are largely covered with Douglas fir and the average height of dominant and codominant fir is found to be 60 feet. The corresponding value for redwood should be 16 per cent less, or 50 feet, and this value plotted on figure 1 over 25 years indicates that the slopes are on site III. Again the corresponding virgin timber is assumed to be of the same site. When the virgin timber is cut the land is to be replanted and protected from fire, and the second growth is to be allowed to grow for 50 years. Its theoretical yield for the flat should then be 200 438 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION acres times 95 m.b.m. per acre (the yield table value for 50 years on site II), which equals 19,000 m.b.m. Applying a reduction factor of 10 per cent to allow for unavoidable damage, etc., a yield of 19,000 m.b.m. minus 1900 m.b.m., or 17,100 m.b.m. is anticipated. In a similar way the slopes in virgin timber are calculated to yield 41,000 m.b.m. 50 years after cutting: (600X76 m.b.m. = 45,600 m.b.m. 45,600 m.b.m. X 90% =41,040 m.b.m.) The existing second growth on the flat is found to have an average basal area of 240 square feet per acre. The corresponding value from the table for site II at 35 years is 399 square feet per acre. The stocking factor is therefore 240 divided by 399, or 60 per cent. This is again reduced by 5 per cent to allow for breakage in logging, or to 57 per cent (.95 X .60 = .57), and the expected yield 15 years hence, or at 50 years of age, is: 300 X 95 m.b.m. X .57 = 16,245 m.b.m. The existing second growth on the slope has, on the other hand, an average basal area of but 70 square feet per acre as compared with the 316 given by the table for site III at 25 years of age. Its stocking factor is therefore: 70-^-316 = 22%. If this is also reduced by 5 per cent it becomes 21 per cent, and the expected yield 25 years hence is 400 X 76 m.b.m. X .21 = 6,384 m.b.m. To summarize, the yield to be anticipated is as follows: River flats now covered with second growth, 16,245 m.b.m., 15 years hence. Slopes now covered with second growth, 6,384 m.b.m., 25 years hence. River flats now covered with virgin timber, 17,100 m.b.m., 50 years after cutting. Slopes now covered with virgin timber, 41,040 m.b.m., 50 years after cutting. THE BASIS FOE THE YIELD TABLES The data on which these yield tables are based were collected cooperatively by two of the principal operating lumber companies in Mendocino and Humboldt counties (the Union Lumber Company and the Pacific Lumber Company), and the Division of Forestry of the University of California. 12 They consist of detailed measure- 12 More detailed information concerning these data will be found on pages 451 ff. of the appendix. Bulletin 361] yield TABLES FOR SECOND-GROWTH REDWOOD 439 ments on a series of over 100 sample plots well distributed through- out the range of the species. The method of selecting the plots, and the figures recorded for each, were as follows : Plot Selection. — Since the general principle underlying a yield study is to base predictions of what will occur in the future on what has happened in the past, and since no managed forests yet exist, it was necessary to locate the plots in stands which, through a fortun- ate combination of circumstances, had fortuitously become fully stocked. This condition is encountered but rarely and then only in small areas in anv one locality. A thorough search was therefore necessary in order to locate desirable material for studj 7 . When the material was found a plot was laid out, its boundaries carefully marked and surveyed and its area determined. Very small plots were avoided wherever possible, except in the case of the younger age classes ; other considerations, however, often made small plots inevitable. For example, it was aimed to locate the plot boundaries inside the area of fully stocked timber, as their proper location was thereby much simplified ; yet this practice of course decreased the possible size of the plot. Where the loss in plot area seemed too serious and it was necessary to include the whole area of fully stocked growth within the plot, care was taken to so locate the boundaries as to include at least the whole crown area of the trees standing within the plot. A rectangular shape was not adhered to, since to do that would have reduced either the plot areas or their completeness of stocking more than was desired. However, triangu- lar shapes in particular and acute angles in general were avoided. Surveys were made with staif compass, and tape. The difficulty experienced in finding fully stocked stands and the small size of such areas as were found indicate that only by planting and adequate protection can the maximum productivity of the land be obtained. Age Determination. — Ages were determined by ring counts made with the aid of increment borers. In some instances freshly cut stumps in the neighborhood were used to supplement or replace these borings, while historical confirmation was sought whenever possible from local residents who remembered the date at which logging took place. Since the borings were made at breast height, allowance had to be made for the time required by the young tree to reach this height. In the case of sprout redwood the allowance was one year, while for Douglas fir, white fir, and spruce seven years were added, the values being determined by an examination of a considerable number of young saplings of these species. 440 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION Plots which were not essentially even aged were not used. Where there was a small range of ages the highest number of years found was the age assigned to the plot. Diameter Measurements. — The diameter of every tree over 2.6 inches on the plot was measured with a diameter tape and recorded to the nearest inch according to its crown class (i.e., dominant, codominant, etc.). Wherever possible the measurement was taken 4.5 feet from the ground, but in fairly numerous instances trees grew so close together in clumps as to make this impracticable. The measurements which, as a result, were taken higher up the trunk introduce a slight factor of conservatism at this point. Height Measurement. — The heights of a dozen or more trees of each important species were measured by either the Forest Service hypsometer or the Faustmann hypsometer, the distance of the observer from the tree being obtained by means of a light cord of known length. The trees selected for measurement were representa- tive and covered the range of diameters present. Their heights when plotted on cross section paper established a curve from which could be read the average height of trees of any required diameter on the plot. Computations. — The computations required are self-evident with the exception of those for volume. The volume in board feet was obtained by means of the diameter tally, the height diameter curve, and a volume table. 13 The volume in cubic feet was obtained by the formula V = BAXHX P : Where V = volume of any crown class, BA = basal area in square feet, H = height in feet of average tree, and F = form factor of average tree. The following form factors, deduced from 941 tree measurements taken by the U. S. Forest Service (see Bulletin 334 mentioned above) were used. No volume tables or form factors were available for the three principal associated species, Douglas fir, white fir, and spruce, and it was therefore necessary to compute their volumes by means of the redwood tables. The bark of all these species is much thinner than that of redwood so that the results obtained by this method were undoubtedly too low. Correction factors of 5 per cent for Douglas fir and white fir, and 10 per cent for spruce, based on a comparatively small number of tree measurements and a somewhat limited study of bark thickness were therefore added. These values are considerably lower than those indicated by the data available and are probably ultra-conservative. is Bruce, Donald. Preliminary Volume Tables for Second Growth Redwood, Bull. No. 334, of this series, October, 1921. BULLETIN 361] yiELD TABLES FOR SECOND-GROWTH REDWOOD 441 Table 5. — Form Factors for Redwood D.B.H. Form Factor 3 inches .45 4 inches .43 5 inches .41 6 inches .39 7 inches .37 8 inches .36 9 inches .35 10-11 inches 34 12-14 inches 33 15-18 inches 32 19-40 inches 31 (These form factors are the ratios between the volume of the stem of the tree without bark and the volume of a cylinder of the same (height andjof a diameter equal to its d. b. h., outside thejoark.) Treatment of Veterans on Plots. — Sometimes, though not frequently, it was found necessary to include within the plot boundar- ies one or more trees which were obviously left uncut at the time of logging and which were therefore considerably older than the main second growth stand. It is evident that the full volume of trees such as these cannot be credited to a plot. On the other hand, to leave it out altogether is ultra-conservative, since they have been occupying a considerable portion of the plot area, which in their absence could have been filled by one or more additional second growth trees. For each of the original trees, therefore, was substi- tuted one tree of a size equal to that of the average dominant on the plot. This procedure probably errs considerably on the side of conservatism. The identification of these veteran trees, which were sometimes only slightly larger than the true second growth, was less difficult than might have been supposed, for three characteristics were avail- able : (1) the bark texture of young trees is quite different from that of veterans; (2) the branching habit of young trees which have many long laterals close to the ground (these persist as dead branches many years after the foliage has died from lack of sufficient sunlight) is distinctive; (3) veterans left in a young stand almost inevitably project well above it in height. 442 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION SAMPLE PLOTS FOE DETERMINING THE STOCKING FACTOR The owner of timberland who wishes to determine the stocking factor for his land must follow very much the same procedure as that outlined above. In this case, however, the plots should repre- sent average density rather than full stocking and should be located with this end in view. Attainment of this object is easier if relatively large plots are selected and the proper location of boundaries, if this is done, involves little difficulty. If, as suggested on page 431, the basal area be used as a stocking index, the volume computations described above are obviously superfluous. SAMPLE PLOTS FOR SITE DETERMINATION Such plots may also be used for site determination, but in some cases special plots selected for this purpose only may be desirable. In such instances the procedure may be somewhat modified and materially abridged. Quite small plots are entirely satisfactory and their area need not be determined. The age should be carefully ascertained, but only the dominants and codominants need be meas- ured for height and diameter. The computation of the average height of dominants and codominants is as follows: (1) compute the total basal area 14 of dominants and codominants; (2) divide this value by the number of dominant and codominant trees to obtain the average basal area; (3) calculate the diameter of a tree having this average basal area; (4) look up the corresponding height in the height diameter curve: (5) modify this value by the proper correc- tion factor if the stand is understocked (see pages 447-449) or if a species other than redwood is being used (see pages 449-451). CONCLUSION Only one familiar with the yield tables for other species will appreciate the full significance of the remarkable figures for redwood presented here. It is therefore desirable to cite a few instances for purposes of comparison. One of the standard European yield tables is that of Schwappach for Norway spruce, one of the fastest growing species used by German foresters. At 60 years of age on the best site this species is assigned a basal area of 231 square feet is Gallaher, W. H., ' ' Secondgrowth Yellow Pine." Forest Quarterly, vol. XI, circles, such as is given in H. S. Graves, "Forest Mensuration/' pages 376-385, and H. H. Chapman, "Forest Mensuration, " pages 480-491. Slightly less convenient tables may be found in any engineering handbook. Bulletin 361] YIELD TABLES FOR SECOND-GROWTH REDWOOD 443 per acre and a volume of 8,798 cubic feet. Redwood at the same age and on the best site has a basal area of 486 square feet and a volume of 20,200 cubic feet per acre. Western yellow pine on the best site in the Sierra Nevada produces, according to Gallaher, 15 a volume of 52 m.b.m. (International rule) per acre at 60 years of age while the comparable figure from the redwood table is 139 m.b.m. One of the most rapid growing conifers in the eastern United States is the white pine, which at 50 years of age, and again on site I, yields 55 m.b.m. 16 Redwood, it will be seen, exceeds this by 111 per cent. On poorer sites the growth of redwood is equally remarkable. Basal area in particular, while less on the poor sites than on the good, is, as compared with that of other species, exceptionally insensi- tive to site conditions. As to volume, it should be noted that the yields of redwood on site III far exceed those of the above mentioned three species on site I. The low age at which redwood reaches a size which would be con- sidered merchantable in most forest regions is also of interest. Nor- way spruce, according to the Schwappach tables, has its maximum average annual volume growth at about 80 years of age on site III, and at this age the average tree is only 8.5 inches in diameter and 69 feet tall. In the case of redwood, equal diameters can be obtained at 25 years, and equal heights at 40. On site I, at the exceedingly low age of 20 years, the average redwood is 8 inches d.b.h. and 50 feet high; the comparable figures for Norway spruce are 2.6 inches and 20 feet. It is unnecessary to multiply instances. Suffice it to say that the redwood has apparently the most rapid growth of all the conifers, and that it can be raised on the shortest rotation. This fact coupled with the comparative ease of reproduction and the relatively low fire risk make it perhaps our most attractive species for forest management. isGallaher, W. H., " Secondgrowth Yellow Pine. " Forest Quarterly, vol. XI, no. 4, pages 531 ff., December, 1913. 16 From "Forest Mensuration of the White Pine in Massachusetts," by H. O. Cook. 444 UNIVERSITY OP CALIFORNIA EXPERIMENT STATION APPENDIX BASIC DATA The basic data for this study, summarized in table 9, pages 452 to 467, consist of 136 plots of which 34 were measured by the forest^ departments of the Union Lumber Company and the Pacific Lumber Company and the remainder by the staff and assistants of the Division of Forestry of the University. Their location by counties is as follows : Mendocino 55 Humboldt 52 Sonoma 13 Santa Cruz 10 Del Norte 3 Alameda 1 Butte 17 : 1 135 Of these plots 96 were used in the tables, 15 (plots nos. 3, 10, 16, 51, 53, 65, 74, 89, 90, 91, 97, 118, 120, 121, 122) were unavailable for this purpose because redwood was not present in appreciable quantities and 24 were discarded for the following reasons: Understocked 12 (plots nos. 25, 30, 35, 66, 67, 69, 82, 103, 107, 132, 133, 134) Plot boundaries possibly located too close to trees within plot 5 (plots nos. 83, 84, 101, 102, 119) Uneven aged 2 (plots nos. 85, 113) Over-dense 2 (plots nos. 34, 80) Plantation outside natural range of redwood 1 (plot no. 124) Sites IV and V 2 (plots nos. 125, 135) In discarding plots, all those which had a basal area 25 per cent above or below the average for their site and age were critically examined, the relative number of trees on them and their average d.b.h., as well as the description of the plot itself being taken into consideration in deciding whether or not they could be used. It should be noted that in the group thus indicated as apparently over- stocked were a number of the surest plots measured, i.e., those of good size, with ideal distribution and density, and with boundaries which were located without difficulty or danger of error. This fact would appear to indicate that throughout the study the words 'fully slocked' had been so liberally interpreted that the resulting tables should be conservative. i' An interesting and successful plantation at Chico. See table 9, plot No. 124. BULLETIN 361] YIELD TABLES FOR SECOND-GROWTH REDWOOD 445 The distribution according to site and age class of the 96 plots (with 2 additional plots from sites IV and V) is as follows: Table 6. — Distribution of Plots According to Site and Age Class Site A ge Class I II III IV V Total Number of Plots 20-24. 3 5 7 5 7 10 10 7 54 6 3 3 4 16 1 1 1 1 3 25-29. 5 10 30-34 5 18 35-39. 4 12 40-44. 6 16 45-49 50-54. 3 2 13 17 55 + Total 1 26 9 98 The relationship between the physiographic location of the plots and their site classification is given in table 7. Table 7. — Relation Between Site and Physiographic Location Physiographic Location Site Class ' I II III IV . v Alluvial Flat Slope Bench Ridge Total County Number of Plots Del Norte and Humboldt 13 1 21 9 5 1 3 2 14 33 8 Total 39 11 1.8 2.0 5 2.4 55 Average site 1.9 Mendocino, Sonoma, Alameda, Santa Cruz " I II III IV V 10 18 6 1 4 13 10 3 4 5 2 14 35 21 4 2 Total 35 1.9 30 11 76 Average site 2.4 3.0 2.3 All counties combined ■* I II III IV v 10 18 6 1 17 1 34 9 15 1 3 7 7 2 28 68 29 4 2 Total 35 67 11 16 131 18 i« The remaining 4 plots for various reasons could not be assigned with certainty to a site class. 446 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION The table indicates: (a) that while the physic-graphically favor- able locations average higher in site, yet there is a wide range of sites within each (see, however, page 449) ; (b) that similar locations average better in site in the two northern counties than they do in Mendocino county or farther south. This difference is consistent with the character of the stands of virgin timber in the two regions. Table 8 gives information concerning the areas of the plots. Most of the smaller plots occurred in the younger age classes. Table 8 — Areas of Plots Size Class Number of Plots .06- .15 acres 28 .16- .25 acres 33 .26- .35 acres 18 .36— .45 acres 9 .46— .55 acres 2 .56— .65 acres 1 .66-f- acres 5 Average area per plot 0.265 acres. 96 THE EFFECT OF PLOT AREA Since, as indicated in the preceding table, and for reasons already explained (page 439), a considerable number of the plots taken were small in area, an investigation was made to see if there was any evidence of the introduction of an error into the tables from this cause. On comparing the basal area of each plot with the tabular basal area for its site class and age, it was found that the 39 plots having an area less than .2 acre averaged 5 per cent above the figures given in table. This discrepancy might be taken to mean that the boundaries of the small plots had been located a little, though not seriously, too close to the trees included in them. A more probable explanation is that, in the effort to secure plots as large as possible, areas which were not fully stocked were often accepted and that this tendency was more marked in the case of plots of larger size. In either case the discrepancy is too small to be important. THE RELATION BETWEEN AVERAGE HEIGHT OF DOMINANTS AND CODOMINANTS AND AVERAGE HEIGHT OF CLUMPS OF SPROUTS This relationship, knowledge of which is needed for the reasons stated on page 434, was determined from the measurements of the height of 60 plots taken by both methods. The results obtained are shown graphically in figure 2. A straight line through the origin expresses the results quite satisfactorily. Its slope indicates that the inenn extreme height of the clumps as determined by the method Bulletin 361] yield tables for second-growth redwood 447 outlined on page 434 exceeds the mean height of dominants and codominants on the average by 6.7 per cent. S o o l> < II ' ;i, : , ; 1 1 i : i nr 1 1 1 rn — m rn" i i ! i * ! Ill 1 I ' ' M 1 ' 1/ III 'ill 1 ' i ' 1 1 \ A ~T I 1 1 tl "111 1—1 II III- 11 II I I i,1 lin "T 4 "" II 1 1 1 .4 L J X i4u -■■ i i i i 1 /; M 1 ■ 1 1 ■ ' ! t I Sa T ! 1 ' ' 1 / iT 1 1 ■ 1 1 1 ' 1 / *? nn I j hii I M 1 M ! / i 1JU ri I I II • l<" i \ A - ; I i M i II / r 1 1 1 1 1 / ' ' ' I I ' I l V 1 i «n ' ' . . .. - .J. . . . . Li t # l^'U 1 ' i hi / 4 1 i i 1 ' / A 1 Mi 1 1 M ' / Mill 1 1 1 1 1 1 II 1 / 1 1 1 n ; l : IN' ' -L.J ' • t \ \ 110 T ' ; • ■ ' i 1 1 L, A Mr i •' / '(■ ! ' ' I ' ill 111 1 1 lll'II 1 i i ! ■ " M 1 " 1 1 i ii-- 1 - 1 — r ou i -I h/ , I r 1 M - ■ | \ A ' 1 ' 1 f j'I ! 1 ' ^ ■ ' ' r - in T~ / ' ' i l.L-J ' ■* u i A \ ' Mi ' ) r ■ ■ T / J ' ' M / in ! / ,, . " ! M ; 6J ^r_ t- tT' - i i ■ I f ' - T i ^ ....... ... | j 1/ it t I T- V A . 1 . 1 °n L- L...J...J ! ' ' i - - u _ \ / ' ■ ! T^T 1 ! ^ 1 ' ' ! i in A, I 1 1U ' 1 _|_i_ _■ I t Mill 1 II III III ' X J " ' 1 ' .,'tt: . i ,? T^ T _. _ . 1 * 1 1 ' t tU — j — I 1 | — __L_LLJ L — u 1 , — i — u LL. Fig. 10 20 30 40 50 60 70 80 90 100 110 120 130 140 Average Height in Feet of Dominants and Codominants. 2. — Eelation Between Average Maximum Height of Clumps and Average Height of Dominants and Codominants. THE EFFECT OF DENSITY ON HEIGHT GEOWTH The method of site determination by height, growth described on pages 433-436 is one which has been quite generally adopted by Amer- ican foresters. It is based on the theory that height growth is either unaffected by variations in density or is at least relatively insensi- tive to them. It seemed necessary to check this assumption in the case of redwood, a species which has been very little investigated. Data were collected in the following manner. Wherever possible several clumps of sprouts were found in close proximity to each plot which were (a) of the same age, (b) on apparently the same site, and (c) in a much more open stand. The tallest tree in each was selected and its height and d.b.h. measured. A count of the 448 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION trees around it (usually on a one-quarter acre circle) was made. These three values, height, d.b.h., and number of trees per acre, were then averaged and compared with similar figures taken within the plot. Such measurements were taken on 28 plots. (In a large number of cases, of course, suitable material could not be found.) When averaged the results obtained are as follows: Within the plots In open stands outside the plots. r erage Number of Trees per Acre Average D.B.H. Average Height 487 19.0 inches 95 feet 201 21.1 inches 84 feet 72 o s a • pH 02 Ph S a i— i o O -^> o> A bo • IH w be G8 u > 10 20 30 40 50 60 70 80 90 100 110 Average Height in Feet of Clumps in Poor Density Stands. Fig. 3.— Eelation Between Average Height of Clumps in Normal Density and in Poor Density Stands. The average height within the plots (i.e., in fully stocked stands) exceeds that of the open stands by 13 per cent. It should be noted moreover, that in only two out of twenty-eight instances did the BULLETIN 361] YIELD TABLES FOR SECOND-GROWTH REDWOOD 449 heights within individual plots show a relationship in the reverse direction. There were in addition, however, two plots in which height growth was distinctly and obviously stunted by overcrowding. Figure 3 indicates that the value obtained (13 per cent) is approxi- mately the same for short or tall stands. The data available did not permit of a more detailed analysis of the effect of density on height growth and no answer could be obtained to the question of how much it may vary before the height growth will be affected. It seems possible, however, that variations in the degree of stocking may be in part responsible for the appar- ently wide range of sites encountered under similar physiographic conditions (see page 445). This possibility is, however, more interest- ing than important, for if in using the tables the same methods of site determination as were used in constructing them are employed no serious error will result. RELATION BETWEEN HEIGHT OF THE ASSOCIATED SPECIES AND OF REDWOOD The data available for investigating this relationship were found in the plots on which Douglas fir, white fir, and spruce were present in material proportions, the numbers being respectively 39 for Douglas fir, 31 for white fir, and 8 for spruce. It was first necessary to determine whether or not any strong correlation existed between the heights of the various species under similar conditions. Using the Karl Pearson coefficient of correlation the following values were obtained : Douglas fir and redwood 85 ± .03 White fir and redwood 85 ± .12 Spruce and redwood 87 ± .06 These figures mark the correlation as exceedingly strong. 19 It was noted that where Douglas fir and white fir occurred simul- taneously their values were essentially the same. For the 14 plots where this was the case the average height of Douglas fir was 110.1 feet and that of white fir 109.3 feet, a difference of less than 1 per cent. Since the data were somewhat scanty it seemed both desirable and permissible to treat the two species as one. Spruce, however, was materially different from either of the others. Figure 4 is a graphic summary of this relationship. It seems to justify the statement made on page 436 that the height of redwood can be deduced with reasonable assurance from that of its associated species if values for fir are reduced by 16 per cent and those for !9 In interpreting these coefficients of correlation it is customary to consider that values over .50 indicate strong correlation, provided the coefficient is at least six times the probable error. Perfect correlation is indicated by 1.00. 450 UNIVERSITY OP CALIFORNIA EXPERIMENT STATION spruce by 20 per cent. It should be noted that these percentages would not be accurate for very young stands (where sprout redwood exceeds all its associates in height growth), nor for very old stands. In virgin timber, redwood is of course by far the tallest species present. 120 100 ft O o « O .2° °3 20 40 60 80 100 120 140 Height of Associated Species in Feet. Fig. 4 — Eelation Between Average Height of Dominants and Codominants of Eedwcod and of Associated Species. EFFECT OF VAEIATIONS IN COMPOSITION ON YIELD The preceding paragraphs indicate that all three of the principal associated species attain greater heights than redwood at the greater ages under investigation. Their effect on basal area was investi- gated by classifying all the plots in groups within which the per- centage of redwood present (computed by basal area) ranged from 100 to 80, from 79 to 60, from 59 to 40, etc. The ratio between the basal area of each plot and that given in the yield table for its site class and age was then determined, and an average value for each of the above described composition classes was computed. The results are given graphically in figure 5. It is evident that a decrease in the percentage of redwood present is accompanied by a decrease in the basal area. If redwood is completely absent, the basal area falls to 76 per cent of that given in Bulletin 361] yield tables for second-growth redwood 451 the table, while if it is the only species present the basal area rises to 5 per cent above that of the table. (It must be remembered that the table itself is based on stands only about 84 per cent pure). Intermediate proportions give an average of these extremes weighted by the percentages of redwood and of associated species present. mi _ ^ 1 1 1 4-fff . , ,',','. — . — : r * t —- frrl I r 1 1 1 il rr " ' uu- _^ 4^ T+*^ i_ M -Hit -+4f : r^ , . i • ■ 1 II . . , ) III , , I ; 4+44- — — 4444-- LLfJ o .... ■ . • ' i ' i ; tHt - — — ^ — i ■ ' 1 1 ' ■ M ' 1 1 • * • ' li ■ * * ■ _^H _ ~* *■ **- 1 -fttf ^T— 1 1 1 1 - o

:; i | ' . i ' i . ' , , ■ ! . ! . llll m x 90 1 , 1 * ' ' ■ ' — 1 ' i i ' ' 1 1 ' ■ . ' ! ' 'L-J-** 1 1 _^ > - ..* — I I ' 1 C3 C3 ' ' I ! 1 ' ! I I u-^-^ ■ 1 ; i | WPQ I _j.,r ^ , I j j ; ■ i i -u a> -^4— tTi i , , : , 1 1 : : : 1 1 ! i \ . i i . ii I , i , : i i m+ ° rx uJ!^~ -H4+ 1 : , 1 ':■''' 1 ■ r r ■ • i ' r ; ^T~r ■ H4f 7T *° 8° X B r-r*^ 1 i 14T -£-£ ' ' r - — ■ 1 . ■ ■ : ., . i | 1! 1 . III j„ H ■;■; '■: | ■ ■ : C : ' I ! :; 1 ■ t ■ 1 '■■:'' - — i ' — • - 1 • "I'M ' [ ' zz^- -»-» ^ " -rr ' ■ ■ ■ ; nil ■ | i ' 1 7 I. ii, ii s ^ ! ' 1 ' I : I ; I 1 f !!'!!!!! ; 'iii ' ' '' ! I ! ' iii! ! 1 1 Per C Yie c nil ■ ' ! ' ■ . I . : , i 1 1 ii. 1 ■ ' ' i ' • — 44 i ■ : ' 1 i ■ : t : • ■ 1 ; ■ ■ ■ j ' | ■ ■ : ' I.,, TT rr TTTTi , . , , i , , ! i . : . . 1 . 1 |J ' • • ' r ■ ' M ^ 1 — — — I : : : j ■ . ' 1 ) i Mil - n llll r4- LLLL rrr + ' 10 20 30 40 50 60 70 80 90 100 Per Cent Redwood Basal Area of Total Basal Area. Fig. 5. — Effect of Composition on Basal Area. The volume of a stand (in cubic feet) is its basal area times its average height, times its form factor. As has been mentioned on page 440 the form factors of the associated species are higher than those of redwood by at least 5 per cent for fir and 10 per cent for spruce. Combining these values with those already given for height and basal area, the effect of the presence of an associated species on volume appears to be from: 1.05 X .76 X 1.16 = .93 for fir, to 1.10 X .76 X 1.20 = 1.00 for spruce. The higher value for spruce is based on insufficient evidence, for all species have necessarily been treated as one in analyzing the effect of basal area. Since the values used for the form factors are probably ultra- conservative, the statement seems justified that the presence of asso- ciated species, at least in moderate proportions, does not materially affect the volume. The average d.b.h., also, will apparently not be greatly modified by variations in composition, although the evidence was found to be inadequate for a precise determination of this point. PLOT DATA Table 9 gives the detailed plot data on which the tables are based. 452 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION CO H O - H m < •< Q o I— ( CO OS H d rH t^ CO O O CO a> CM co 3 - 00 00 T* CO 00 00 CO C u 00 r— co HH rH »o i-H O O CO 33 CO o O o3 CO rH IO CO CN CO 33 00 rH 33 CM O T-H 1-1 t^ rH s CM rH ■ CO ^H CO X a 00 CO TjH +a bo s Q •<+! »o CO CO CO co co N. ^H r-H CO CM d rH 10 co O rH t^ co H CN t>- 00 CN CN CO CO 00 CM "0 3 r-H rH CM o CO a -+J c 00 U2 CN CO CO 00 >o ■* 00 •o O CM O O •^ o 00 ■<*! 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OS t^ CN IO t> 00 CO rH 03 a CD l-H l-H CO l-H l> CN 10 l-H CO 10 CO fa O T-H i-H u-o 00 CO CN CO co os CO CO 00 CN T-H T-H r>. CO CO 00 rH CO CO <-H O O co »o ■* Tfl os O CO i-H l-H IO CO O l-H 3 lo »o l-H rH CN i> CN CO (N t^ TH 00 CO CN 3 H O D S b- t- CN O CN «0 O >0 <* l^ 00 •* CN O OS CN CN »0 CO CN CO CM OS b- IO i-H OS CN os 00 os CO b- iO i-H CO OS CN O iO co os CN TfH I-H CO i-H CN O CO i-H t>. l-H *o co CO CO t-H l-H T-H CO rH 00 Q CN l-H i-H i-H 1— 1 T-H i-H a CO b- l-H O 00 r-~ iO CN i-H — 1 CN CO os os 10 rH 00 CO 00 l> OS t> l> 00 t> os IO t>. co "Si O <° CO i-H -4J 00 CO >o 10 co os IO CO CO 00 00 OS CO 10 10 CO IO t-H age Hei ording t iwn Cla: c OS CO 00 OS os i-H os os O O OS 00 M i-H l-H i-H i-H i-H T-H i-H i-H T-H T-H A a O-o 00 r^ iO 00 CN i-H CO 00 10 O os os TH rH tH CO r« »o CN GO OS O O i-H i-H —1 CN l-H O i-H tH l-H O CN li o o l-H l-H l-H T-H l-H rH t-H l-H T-H i-H T-H i-H i-H l-H i-H T-H CD C_^ «! a O CO O «* t> CO T-H OS O os os os 1> o CO CO O OS ■* O rH O CN OS CN co i-H CO CN "# OS t> 10 IO IO l> CO rjH l> t-H CO CO CN CO t>I OS os CO O m i-H i-H T-H l-H "* 00 co co OS CO CO rt* 00 CN r~ CN CO 10 O IO 00 1> CO 01 03 3 l-H ,1 Ar ding nCl CO CO CO CO Tt< CN CO CO CO CN Tt* O CN CO CN CN T-H t— 1 i-H CN i-H CN CO rH t-H 4| t^ co CO ^H co i> O O l> CN CN CO rH co 00 co co Basa accor Crow CO CO l-H CO CN O os CO -# co co rH OS CN CO OS CO 6-°, l-H 10 CO 10 (N i-H CO 00 CO CN os ■* t^ tH CO os 10 1— 1 i-H CN i-H i-H CN CN l-H CO os co 1-1 1^ O CO OS i-H 00 r~ t> IO O os CO >o CO i-H t- co a 10 CO OS OS i-H T« CN CO ■* os l-H IO 00 rH CO OS OS CO »* os 1^ OS rH CO 00 OS CO OS l-H CO l^ CO CN rH IO os 0) .S CO CD c<3 l> O 00 l> os •* rt< i-H t^ IO l> IO Tt< i-H 00 iO CO CO CN 'i Mr? l-H i-H l-H l-H l-H T-H CN CO CN <«'-3 a °c3 * i a CN CO O i-H iO OS CO CN to i-H t*I l-H CN CO rH T-H l-H l-H T-H i-H l-H og2 £ So s rH 00 CN IO CO CN CO i-H CO OS CN t>- rH co CO fa fa w ^ ■ • 1^ — Ph P ^ S Ph P fa « p fa Dh P ** Ph P ^ fa ^ Ph P fc CO CD CO l-H l-H 1— 1 l-H l-H hH l-H l-H l-H 1— 1 l-H l-H I— 1 l-H 0) M O 1 — 1 O t^ l> CO O <3 IO IO IO IO T*< rH TfH IO -H 00 CO CO Os CN i-H OS CO CN O CN rH O CN (N CO CO CN CO CO CN << CD a jo CD W) CD to -3 CD a jo CD s CD 3 CD a CD a co a CO S 5 co CO CO co co h i-c h u kl s- In CD CD CD CD CD CD Jd CD >> -l-i +j •*> +J -|J H-> 4J -*> -u f 3 M F 3 M f. CD g M ? CD CS CD M O o h-) 05 •f- rJ cd -s cd & X CD CJ •a 2 co r ^ CD O co r *i CD O J3 V CD U - CD CD O -3 CD co >-< co CD -3 CO CD CD tH O u U E Ih l_ M h (h «5j fa fa fa fa fa fa fa o\o CO t>- 00 OS O ^ CN co £ K T-H I-H r-< l-H CN CN CN CN Bulletin 361] yield tables for second-growth redwood 455 Tft IN OS C5 ■«* t^ CO ■^ »* CO -+< »o re CO **« (X o rf< rH t^ CO 1* co t^ r- CS CO 1—1 (■» 1— 1 IO CM os ■* CO ■* co 00 ^H 1— I CM CO CM 1—1 1— I 1— 1 ■HH IO o N •<* CO co CO ■* CO CS CN CS (N ■^ CO 00 r^ e> Tt* ~ ■>* iO ns N CO IO •o I-~ CO io 00 CS i-H 00 o ~1 OO o r^ CM CO o o O t-- CM 00 o co "# Tt< ro CO 1^ CO CO rH o — CO 0B CM CM CM co t^ io 1—1 CO T* CO N 1—1 IN >o ■* T* CO — i (N -H •o CO i-H l^ •-C r^ co (N CO oo m 00 •* — Iffl b- CM OS co rH 1—1 CD CS oo CO r^ •r+l CO cs 1—1 to CB i—i 00 CD »o r^ t~ t~ IO — rH CD CD c-. co 00 t^ CO o re 00 CN 00 CS co CO — CM oo 00 1— ( CM CO •o 00 CD o o r-i i— i t^ CO co -H TJH 1—1 CO IO 1—1 IO (N 1—1 1-1 iO CO ■»* o •* CO co >* ^ CO cs 1—1 CD r^ CS 1—1 >o cs o ro 1—1 i—( o 1—1 •rj< r^ — co 00 CO CO cs CO i—i CM CO * cs Tt< N ^ OS 1—1 30 cs oo Tt< i—i io 1-0 00 t^ 10 . 00 CO 00 id IO >o 00 IO IO 00 l> C6 IO t^ ,_, n ,__, i-H co r oo co co 00 cs cs IN •* co CI ■* r^ cs cs os co OS o 1—1 00 o X CO OS 00 os 00 t^ CS f~ t^ o OS cs t^ at CO t^ t» — •* i— I o o CO 00 o CO 00 CO o 1— 1 CI o 00 Cl o CO o P0 CM OS i—* OS o o o OS o OS 00 i-H cs o i-H o r-l 00 00 I— 1 i— i i—i i-H i-H 1—) 1— 1 i-H 1—1 1— 1 1— 1 I-H -H N S h O O M CNO0 CSOO-* CO COi-i (NOSCN COCSO i-h(Nt}<0 ^h-h CN-'fCO OSCNCO H N OINi-H CS ^h-h CS^HCN O »-< CN i-HCN^CO CSOS t>. »o ^ co r- co t- o co^ r lo cn" t^ o o o ■* co >o co >o t^CO^CDCN h N i tJH CN '-i© COCO tjJ |> CSCO IO0000 t^ lOi-H IO CO ^ ^ ^ ^j Jj oo io cs o oo io i-h t^ h- •<*< »o^ F» co cs cscs'O i* in io t^co O^h^h C5IOCO00 I^CN i-i CO IO iO OO H O (J TJ-lcNiO CNi-l CM i—* *~~* 1— ' 1— ' 1— ' (M 00 CO iO •*'t^OOOSCO'-iO O >-i © CO ■* >-i ■«* Tt< CO CN COCN iS tNJ CO »-! CO ^H ■ O CO CD O •* © IO ^ IO N "O OS CM CO © O l> CO 00 N ^H .-I -^ tJ< © CM •^ii-HOO N CO 00 ^H-* 00 * IO t^ t^O l^-^^H 'Jl 00 CO 00 ■* 00 H t^i-H S 00 N ©©00 H N H N C( IO COCM 00 H N CD©© CSCMIOCO r^CM C^CM^h IO ■* i-iiD i-H CN i-i <-< CN <-< i-l O ^H iO 1— 1 7—1 i—l i-H co CM —I © 00 iO CM IN 00 o iO 1-4 © © IO ^ CO CM >o iO CM CO © ■* CN IO O © i-H CM CM H if H i—l TtfC 1-1 Ch Q ^ ^ fe W # g rt P E5 « P ^ fa fa. « P ^ ^ fa ,pE i rt P ^ as a _o 55 OS a o 55 CD & »— I 02 03 co as a ^O 53 as Ch as a ^O 55 as a o 55 as a 55 fe fa P3 P I—l r- 1 I-H rH >-4 r- 1 I-H (-H 1— 1 t-H r—t 1— 1 M I—i r- 1 r—( 1— 1 t-i 1— 1 © IO iO iO © © "<* ■* © CM IO Tf iO iO rfi ■* ■* >* ■* co oo CM co CO co © iO CM IO © © CO © o t^ © 00 T»l © CO CM CM CM rH CM rH CM CM 1-4 as a o CO u as as to ? -M -M +3 M -r- I-' > as ? M -i ii lui S-. u u £ Eh fa Ch Cm Ch Ch Ch Cm Ch • CO GO CO O © © CO 00 —i N N CO rH rH O CO CO -H co rH oo 00 CO CO GO GO 00 iC t» o ■<* rH tN CO CD CO © CO co in. co CO o tN. © 00 © CO CO CO © o In. tN. CO CO Tt< CO >o CO •* iO © -h CO -h H< CO © 00 00 CO CO O 00 © © ■<$< IN © CO CO t>. rH tN © >0 CO CO © lO © © iO tN In. t>. 00 «* o © 00 © © o © 00 © co © co «* o O tN tJ< tN tN CO 00 00 CO CO "<# a> ■* ^ © © 00 ^H IC o 00 ^H r-l © co © «s ■* © rH CO © tN • © © CO tN. In. t^ t» CO iH -h CO CO 00 CO «5 -# a —■ i 00 -h tN i—( lO rH 00 tN © 00 tN Tf O 00 lO tN 00 CO -h r» © CO tN. tN tN tN lO — I i— 1 tN tN r-i i— I © CO © t^ 00 CO CO © tN. I— I tN In. © 00 CO © CO H O - Cm - Oh •< GO A < <; Q I— ( /. «! w ►H A H 03 O ? So - 3 CO £ o P tN t» X © In. © O tN tN. t^ iO © ■<* •* iC © 1— i *—* tN. © © »N. o © © 3 i— i 00 U0 © ■* tN © © 00 tN © co o 00 © i-H tN © t» CO 00 CO "* CO 00 00 00 N ifl N © 00 t^ "* ■<** t^ i-< © 00 CO rH CO OHM i— ( i—i 00 t- CO © © © © Tf< 00 © i-H CO o © © rH © CO © 00 tN © N* CO tN. GO rH O O O tN —I CO 00 © t}« © © rH CO CO O C> ~* CO lO rH © © IN iO © ■* GO © © O 00 H ° S CD cS -Sjfo ■ - - - mo* 03 u O a 3 CO n 5 g o - CO 00 iO "* CO rH iO © © © ^ co oo >o tN O) O H Tjl ■* tN CO rH In. CO 00 tN. -HH CO 00 CO © »o iO GO © 1-H 00 In. tN. r-t tN. © O H N Tf © 00 "0 CO 'O i-H CO CO »-H © N# >o 00 © »o 1—t iO o © CO © CO CO © CO CO CO t- © i-H 19.83 1.57 iO © lO rH CO CO rH CO t>- © 00 o ^ © CO © © © "O GO © tN. O iO o T}< i-H © © © 00 CO "0 oo co CO IO rH rH CO CO CO © © CO CO ** Tj< CO rH tN. O © tN. O tN. "# iO CO CO tN. o 00 00 •<*< tN- iO i-H CO 00 iO © © CO ^ m © CO CO © CO CO O 03 a> s3 *— ' ~0 3 O u > . o > 6 ° 2 ■ w O f" 2 03O a 3 w E O p tN. CO »o © CO CD CO tN. i-H CO 00 tN. CO OO CO rH © lO CO CO © CO ■* lO CO -41 H H © CO CO +s c >-H ■* iC ■* CO © t> cc ^ "* ■* © rH 00 CO rH © 00 CO CO CO rH CO rH t—( iO rH © »o 1-H ■* © co rH CO CO © © iC CO ■* 1-H 1-H 1-H rH rH © CO as rH Q is « P &H .2 fin P ^ S > HH ^ rtP^ fe HH tf P ^ Ph 2.2 co"S CD a o CO o a o co 0> a ^o co 0> a o a o 55 « a o .— • co a 55 i a CO V oo *» 03 co 5 H- ( HH HH HH HH HH >—l >—{ >-* HH HH H- 1 H CO H< 00 © Tj< © ^H © < •«*< •<* CO CO CO co CO CO " t si © CO co Tf tN. CO tN. tN. "0 CO "* iO © ^ CO tN. rH CO 1-H CO CO rH 1-H rH <^ a o 55 S3 o O r-l 0) *s -J 4j "fi 2 e -H> co *r 0v O ^ P 3 -i CJ co 0> CD o -H> -S cy - CD CD O - /■ iO CO © CO In. co 00 CO © CO o T}1 to -3 5) 3 3 O «55 Bulletin 361] yield tables for second-growth redwood 457 tN 00 CD CO tN co co CM »D o 00 lO tN CO 00 o CS OS CO co CS CS CS lO lO r^ cs CO l>- CS CS Q ■H CO 1— 1 1—1 ID CO >o CO tW CO co ■»* CS -»f >0 ^ M Oh ■* N -- » b- — lO S 00 M 00 w co tN tN co oo o -^ >o cs ^- co ID n oo o tN CO — i -< O) O CO ** -* CN lO CS lO CO — i •«*< Ci tN ■<* CO Til 00 O N Oq -rf CO CO "*< CN CO CO CO CO co o CO o co CO i-H tN o tN CO co ID 00 tN 1~~ T* — i — < go O CO T* ■* tN .-i r)< OS 00 ~* CS t* •* b- -H CO t". 00 i-h i— t co 00 CO ,H tN CO rH •"' >— I I— 1 CO 00 OS CO 00 "* -r — CO 00 tN 00 CN tN t» lO CO — « 00 CO CO l^ f~ CO 00 i-H tN CO tN >o tN l-H -h CO 00 f^ CO tN »D CS OS O ^ t^ O CO ^H i-H i-H o o co ■* co O O ID CO 00 i-i co —I tN CS -H Ci O Oh tN -hh tN ID ^h CO tN CO >D CS o -* co co co h- oo ** -h (D O (3) S co co cs >o CO >o co co ID CO >o CD >o •D iD co ID O >D o tN 00 CS X OS co tN ~H f~- ■* tN tN os 00 Ci CO b- tN t- iD tN CO CS CO co o tN ID 00 tN O -> co CS CD Oi tN ■* ■^ 00 o co CO 00 ~. a 'N 00 co o -f IQ CN O co CO t^ t^ US OS co t~ CO c^ ^^ l^ O OS i-H CO o o T)< CO 00 >o co 1-H CO CO l> 00 o> t^ 00 t^ OS i-H ^H rH i-H CD at o a o o CO CO ~ o o t^ X co Tf« r^ »— i co co oo N. t~ 05 ■M CO •* o 1—1 i-H tN OS o ^H 00 ■N ^H i-H -r CO tN ~ HH ^h 1— 1 — ■* 1 — 1 1— 1 1—1 — — H -H i-H •—< i-H r-H 00 OS b» C5 ~ T»l tN iO 1^ T(< CO lO ■* r^ co t^ CO 00 CO ■~ ■* 00 o tN I -1 CO CO tN 00 ID CO t^ lO ■* CO 3 «o tN O H io tN OS CO CO 00 ■HH ^H o co tN o 53 CO 00 CO OS so © os cs O ID 00 co os oo h os CS ID ID ■* CD i-H ID CD >D !> 00 CO t^ CS 00 N O CO i-l CS t>i »D tN tN O CO tN CO M 1H Tf CD O tN CO >D CO CS -H 00 i-H 6h fe tf ^^ ^^ * ■- K ao ^ £* • ^ 2 O CS ID m "5 a 00 X CO CO i-H CN H CO CN 00 >D >D CN CO >.- CN tN CD i-H CO T—{ 00 co ■* CO tN CO co i-H ID CN i-H CN CN CN co tN - CS CO i-H 1-H i-H CN ■* CO -H o 1-H rf i-H 1-H 00 CO i-H i-H CO CN co ID os • »D CN CO 1-H t^ ID CI ^H 1-H CI CO i-H o CO CO —J tN tN tN CO CO CO i-H ID i— < C-l 1-H C) 00 t"- Oh ^ >-H >-H I-H >— 1 t-H l-H I-H I-H l-H I-H l-H ^ cs CO o CO o ID l^ CN CN r^ Tf< CO T* >* CO 00 CO O) 00 00 oo CO t^. co 1* o "* t^ CN O ■* o 1-H i-H CN co i-H tN <0 a ^o 53 a _o a ^o o G 05 hO o a as CO J3 u a) 43 v a ■- oq ■ COCO Oh tf CN CO c o c o >D S3 cu - 3 H CD 03 -^ - 3 H 03 3 H 00 o3 o |H 3 H CS 458 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION 3 co oo o co CO IN CO CO CO «-H CO ^f 00 h o IN U5 N r-i M O CO CO OS «H O CO i-l »-H CO iO CO O 00 CO CM 00 CD CO CD -*f CO 00 CD IN 00 CO CO o ID 00 CD -h CO os a >D o IO IN N H ID O CO o ■* O t- Tf 1-H CO IN OS CN CO CO ° a "* l> CO CO Tf CO CO iO i-l « O O 00 O N N CO IO N IO H CN CO oo 00 ID CO co b- CO Tf SOS O (N O ID CO IN IN O t)I CN 00 CD 00 CO CO O Q a co CO CD CO CN 00 CO 00 CD •O O 00 t> CO ID IO D H i< IN >D IN i-i CO 00 if TjH i— I >D i—l ID ID S CO CN OS CN os oo co oo IO H IO S S OS ID OS CO i-h CO Tf Ol O N H N rt iO rf S Tf i-l OS IN IN CO 00 CO CO os CO ID IN 00 CO D ^ N H IO i* CO ■-! 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O 3 o c3 6 O o c o a ccj CD > 03 rl c3 fa So n . fa PL, Ph &H CB tf « rJ pq CO t^ X OS o i—i CN CO r}< MS CM CN o -r» IO T3 T3 c3 OJ s ^3 "o > Ct> O u -u CD M O H rO 33 ♦3 B 3 > -co a eS T3 O O •; — 0) tH o ~! o <7) - J gq to cu CJ CD ~ ■Ji -z CD +-> ri CD Cj CJ O 3 '/• (-. DO a CCS BO <— . <— o o CD > o STATION PUBLICATIONS AVAILABLE FOR FREE DISTRIBUTION BULLETINS No. No. 253. Irrigation and Soil Conditions in the 331. Sierra Nevada Foothills, California. 332. 261. Melaxuma of the Walnut, ''Juglans 334. regia." 262. Citrus Diseases of Florida and Cuba 335. Compared with these of California. 263. Size Grades for Ripe Olives. 336. 268. Growing and Grafting Olive Seedlings. 270. A Comparison of Annual Cropping, Bi- 337. ennial Cropping, and Green Manures 339. on the Yield of Wheat. 273. Preliminary Report on Kearney Vine- 341. yard Experimental Drain. 342. 275. The Cultivation of Belladonna in Cali- 343. fornia. 344. 276. The Pomegranate. 278. Grain Sorghums. 345. 279. Irrigation of Rice in California. 280. Irrigation of Alfalfa in the Sacramento 346. Valley. 347. 283. The Olive Insects of California. 285. The Milk Goat in California. 348. 286. Commercial Fertilizers. 349. 287. Vinegar from Waste Fruits. 294. Bean Culture in California. 350. 297. The Almond in California. 351. 298. Seedless Raisin Grapes. 352. 299. The Use of Lumber on California Farms. 304. A study on the Effects of Freezes on 353. Citrus in California. 354. 308. I. Fumigation with Liquid Hydrocyanic 355. Acid. II. Physical and Chemical Prop- 356, erties of Liquid Hydrocyanic Acid. 312. Mariout Barley. 357. 813. Pruning Young Deciduous Fruit Trees. 316. The Kaki or Oriental Persimmon. 817. Selections of Stocks in Citrus Propa- 358. gation. 319. Caprifigs and Caprification. 359, 321. Commercial Production of Grape Syrup. 360, 324. Storage of Perishable Fruit at Freezing Temperatures. 361 325. Rice Irrigation Measurements and Ex- periments in Sacramento Valley, 362, 1914-1919. 363 328. Prune Growing in California. Phylloxera-Resistant Stocks. Walnut Culture in California. Preliminary Volume Tables for Second- Growth Redwoods. Cocoanut Meal as a Feed for Dairy Cows and Other Livestock. The Preparation of Nicotine Dust as an Insecticide. Some Factors of Dehydrater Efficiency. The Relative Cost of Making Logs from Small and Large Timber. Studies on Irrigation of Citrus Groves. Hog Feeding Experiments. Cheese Pests and Their Control. Cold Storage as an Aid to the Market* ing of Plums. Fertilizer Experiments with Citrus Trees. Almond Pollination. The Control of Red Spiders in Decidu- ous Orchards. Pruning Young Olive Trees. A Study of Sidedraft and Tractor Hitches. Agriculture in Cut-over Redwood Lands. California State Dairy Cow Competition. Further Experiments in Plum Pollina tion. Bovine Infectious Abortion. Results of Rice Experiments in 1922. The Peach Twig Borer. Observations on Some Rice Weeds in California. A Self-mixing Dusting Machine for Applying Dry Insecticides and Fungicides. Black Measles, Water Berries, and Related Vine Troubles. Fruit Beverage Investigations. Gum Diseases of Citrus Trees in Cali- fornia. Preliminary Volume Tables for Second Growth Redwood. Dust and the Tractor Engine. The Pruning of Citrus Trees in Cali- fornia. CIRCULARS No. No. 70. Observations on the Status of Corn 166. Growing in California. 167. 82. The Common Ground Squirrel of Cali- 170. fornia. 87. Alfalfa. 172. 110. Green Manuring in California. 173. 111. The Use of Lime and Gypsum on Cali- fornia Soils. 174. 113. Correspondence Courses in Agriculture. 175. 117. The Selection and Cost of a Small Pumping Plant. 178. 127. House Fumigation. 179. 136. Melilotus indica as a Green-Manure Crop for California. 182. 144. Oidium or Powdery Mildew of the Vine. 148. "Lungworms." 183. 151. Feeding and Management of Hogs. 184. 152. Some Observations on the Bulk Hand- 188. ling of Grain in California. 190. 155. Bovine Tuberculosis. 193. 157. Control of the Pear Scab. 198. 159. Agriculture in the Imperial Valley. 199. 160. Lettuce Growing in California. 201. 161. Potatoes in California. 202. 165. Fundamentals of Sugar Beet Culture under California Conditions. 203. The Country Farm Bureau. Feeding Stuffs of Minor Importance. Fertilizing California Soils for the 1918 Crop. Wheat Culture. The Construction of the Wood-Hoop Silo. Farm Drainage Methods. Progress Report on the Marketing and Distribution of Milk. The Packing of Apples in California. Factors of Importance in Producing Milk of Low Bacterial Count. Extending the Area of Irrigated Wheat in California for 1918. Infectious Abortion in Cows. A Flock of Sheep on the Farm. Lambing Sheds. Agriculture Clubs in California. A Study of Farm Labor in California. Syrup from Sweet Sorghum. Onion Growing in California. Helpful Hints to Hog Raisers. County Organizations for Rural Fire Control. Peat as a Manure Substitute. CIRCULARS — Continued No. No. 205. Blackleg. 238. 206. Jack Cheese. 239. 208. Summary of the Annual Reports of the Farm Advisors of California. 240. 209. The Function of the Farm Bureau. 210. Suggestions to the Settler in California. 241. 212. Salvaging Rain-Damaged Prunes. 214. Seed Treatment for the Prevention of 242. Cereal Smuts. 244. 215. Feeding Dairy Cows in California. 245. 217. Methods for Marketing Vegetables in 246. California. 218. Advanced Registry Testing of Dairy 247. Cows. 248. 219. The Present Status of Alkali. 224. Control of the Brown Apricot Scale 249. and the Italian Pear Scale on Decid- 250. uous Fruit Trees. 228. Vineyard Irrigation in Arid Climates. 251. 230. Testing Milk, Cream, and Skim Milk for Butterfat. 232. Harvesting and Handling California 252. Cherries for Eastern Shipment. 253. 233. Artificial Incubation. 254. 234. Winter Injury to Young Walnut Trees during 1921-22. 255. 235. Soil Analysis and Soil and Plant Inter- relations. 256. 236. The Common Hawks and Owls of Cali- 257. fornia from the Standpoint of the 258. Rancher. 259. 237. Directions for the Tanning and Dress- ing of Furs. The Apricot in California. Harvesting and Handling Apricots and Plums for Eastern Shipment. Harvesting and Handling Pears for Eastern Shipment. Harvesting and Handling Peaches for Eastern Shipment. Poultry Feeding. Central Wire Bracing for Fruit Trees. Vine Pruning Systems. Desirable Qualities of California Bar- ley for Export. Colonization and Rural Development. Some Common Errors in Vine Pruning and Their Remedies. Replacing Missing Vines. Measurement of Irrigation Water on the Farm. Recommendations Concerning the Com- mon Diseases and Parasites of Poultry in California. Supports for Vines. Vineyard Plans. The Use of Artificial Light to Increase Winter Egg Production. Leguminous Plants as Organic Fertil- izer in California Agriculture. The Control of Wild Morning Glory. The Small-Seeded Horse Bean. Thinning Deciduous Fruits. Pear By-products.