32 BULLETIN 308, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 17.—Yearly increment* per acre of fully stocked paints ope shorileaf 
pine in Arkansas. 
PERIODIC ANNUAL INCREMENT. 
Scribner rule. Doyle rule. Solid measure. 
Age. Quality. Quality. Quality. 
T IT. TTI. I EE. TIT I INE TIT 
Years.| Bd. ft. Bd.jt. | Bd.ft.| Bd. ft. Bazft. \tBdsft: | Cust Cu.ft. \ Cu. ft. 
ZO Pewee = ont |e aine sis | ise ein | Soneee als sie] aoeiteiesias =| Sacre — olf eter eee rere eee | 
25 940 WAL Bossa 5sel bacconcene hosocasess||baecocse 226 156: feo e222 
30 960 630 340 480 360 260 254 174 96 
35 980 640 340 620 460 280 232 166 98 
40 1,020 640 380 740 540 320 190 142 98 
45 1,000 640 420 840 580 340 144 118 92 
50 980 650 440 840 600 360 118 106 90 
55 960 680 480 760 560 340 106 94 90 
60 930 750 480 680 480 320 94 92 88 
65 900 690 500 620 480 320 88 86 84 
70 880 690 500 580 440 300 80 78 76 
(| KASeARRGS ~ 670 520 560 440 300 72 72 72 
nly Begocedcos 630 500 540 420 300 66 68 68 
25 510 300 105 170 110 50 145 100 55 
30 585 355 145 220 150 85 165 115 60 
35 640 395 170 275 195 110 175 120 65 
40 690 425 200 335 240 140 175 125 70 
45 720 450 220 390 275 160 170 125 75 
50 750 470 245 435 310 180 165 120 75 
55 765 490 265 465 330 195 160 120 75 
60 780 510 285 485 345 205 155 115 80 
65 790 525 300 495 355 215 150 115 80 
70 795 535 315 500 360 |- 220 145 110 80 
18) baosecGace 545 330 505 365 225 140 110 75 
SO teases ees 2 550 340 505 370 230 135 105 75 
1 Based on 38 fully stocked sample plots; total area, 5.8 acres. Saw timber scaled to 5.5 inches in top 
inside bark. Stump height, 1 foot. All trees 6 inches and over breast-high diameter were scaled. 
2 A continuation of these figures indicates a culmination of mean annual increment at about 100 years 
with an increment of about 560 board feet. 
ROTATION. 
It is always desirable to determine in advance the length of the 
period through which the stand should be allowed to grow. This 
depends largely upon (1) the age at which the average yearly growth 
is greatest, (2) the kind of material desired, pulpwood, cordwood, or 
saw timber, and (3) the total cost of producing the material. The 
most reliable basis for determining the age at which to cut the stand 
is the time when the average yearly production is the greatest. This 
will then be modified in accordance with the kind of timber that is 
desired. Other factors to be considered are taxes and protection 
figured on the basis of compound interest, as well as stumpage values 
and market demand. The age at which the highest net money re- 
turn will be secured, or the financial maturity of the stand, may 
