30 BULLETIN 308, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 15.—Yearly increment? per acre of fully stocked second-growth shortleaf 
in North Carolina? 
PERIODIC ANNUAL INCREMENT. 
Scribner rule. Doyle rule. Solid measure. 
Age. Quality. 
aE: TIT. 
Years Bd.ft. | Bd.ft 
Oe | BOOS 370) Sect El S300 hoes ae ar eee 
25 OO ;, 3 | ake ee 
30 773 (ee 
35 310 240 
40 315 250 
45 320 255 
50 315 255 
55 310 260 
60 300 260 
65 290 260 
70 280 260 
75 275 255 
80 265 250 
MEAN ANNUAL INCREMENT. 
20 285 175 50 100 1 Ey eo 107 69 32 
25 335 205 80 140 OD! Sone ane 109 74 38 
30 370 240 110 175 105 35 111 78 43 
35 405 270 135 205 135 65 113 81 48 
40 430 295 160 225 160 90 115 83 52 
45 450 320 185 245 175 110 116 85 55 
50 470 340 205 255 190 125 117 87 58 
55 490 360 225 265 200 135 117 88 60 
60 500 375 245 270 210 145 117 89 62 
65 510 385 260 75 215 155 116 90 63 
70 515 395 275 275 220 165 116 90 64 
75 520 405 295 280 225 170 115 90 65 
80 520 3410 “| 310 280 225 175 114 90 65 
1 Based on 80 sample plots in fully stocked stands; total area 21.6 acres. Saw timber scaled to 5.5 inches 
in top diameter inside bark; stump height 1 to 1.5feet. Volume ofstem is from 1-foot stump to 6-inch top 
diameter, including bark. All trees 6 inches and over in diameter breast high were scaled. 
2 Counties in North Carolina are: Alexander, Burke, Cabarrus, Catawba, Cleveland, Davie, Gaston, 
Lincoln, McDowell, Rowan, Rutherford, Surry, Wilkes, and Yadkin. : 
3A continuation of these figures indicates a culmination of mean annual increment at about 90 years, 
with an increment of about 420 board feet. 
