30 



BULLETIN 308, U. S. DEPARTMENT OF AGRICULTURE. 



Table 15. — Yearly increment 1 per acre of fully stocked second-growth shortleaf 



in North Carolina. 2 



PERIODIC ANNUAL INCREMENT. 



Age. 



Seribner rule. 



Doyle rule. 



Solid measure. 



Quality. 



Quality. 



Quality. 



I. 



n. 



III. 



I. 



II. 



III. 



I. 



II. 



III. 



Years. 



Bd.ft. 



Bd.ft. 



Bd.ft. 



Bd.ft. 



Bd.ft. 



Bd.ft. 



Cu.ft. 



Cu.ft. 



Cu.ft. 



20 



500 



370 





300 







112 



82 



50 



25 



530 



400 



240 



320 



280 





117 



88 



59 



30 



560 



430 



275 



340 



295 





121 



93 



66 



35 



590 



460 



310 



360 



310 



240 



124 



98 



72 



40 



620 



485 



340 



380 



315 



250 



126 



101 



76 



45 



650 



505 



370 



400 



320 



255 



127 



104 



80 



50 



680 



525 



400 



380 



315 



255 



128 



106 



82 



55 



655 



540 



425 



365 



310 



260 



123 



104 



84 



60 



625 



550 



455 



350 



300 



260 



117 



101 



83 



65 



605 



560 



475 



330 



290 



260 



112 



97 



81 



70 



580 



545 



500 



315 



280 



260 



106 



92 



78 



75 



560 



520 



475 



300 



275 



255 



100 



87 



75 



80 



540 



490 



445 



285 



265 



250 



94 



82 



71 



MEAN ANNUAL INCREMENT. 



20 



285 



175 



50 



100 



15 





107 



69 



32 



25 



335 



205 



80 



140 



65 





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 



275 



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 



3 410 



310 



280 



225 



175 



114 



90 



65 



i 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 1.5 feet. Volume of stem 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. 



3 A continuation of these figures indicates a culmination of mean annual increment at about 90 years, 

 with an increment of about 420 board feet. 



