﻿

24 



BULLETIN 24, U. S. DEPARTMENT OE AGRICULTURE. 



Table 3. — Growth and yield of cottonwood (Populus deltoid es Marsh) m pure, 

 fully stocked stands in the Mississippi Valley. 



Age. 



Number of trees 

 per acre. 



Average 



size. 



Yield per acre. 



Averag 



i annual yield per 

 acre. 

























14 inches 

 and over. 



All 

 trees. 



Diameter 

 breast- 

 high. 



Height. 



Stem 

 wood. 



Scrib- 



ner dec- 



imal. 



Doyle. 



Stem 

 wood. 



Scribner 

 decimal. 



Doyle. 



Years. 







Inches. 



Feet. 



Cu.ft. 



Bd.ft. 



Bd.ft. 



Cu.ft. 



Bd.ft. 



Bd.ft. 



5 







2.0 



22 



650 







130 







6 







2.8 



29 



875 







146 







7 





1,450 



3.5 



36 



1,025 







146 







8 





1,163 



4.2 



43 



1,250 







156 







9 





900 



5.0 



49 



1,500 







167 







10 





699 



5.7 



56 



1,800 







180 







11 





558 



6.4 



61 



2,175 







198 







. 12 



"3 



452 



7.1 



67 



2,600 





200 



217 





'ii 



13 



8 



375 



7.8 



72 



3,050 



800 



700 



235 



"62 



54 



14 



15 



320 



8.5 



76 



3,500 



1,600 



1,300 



250 



114' 



93 



15 



22 



276 



9.2 



81 



3,850 



2,400 



1,900 



257 



160 



127 



16 



29 



243 



9.8 



85 



4,150 



3,200 



2,600 



259 



200 



163 



17 



34 



217 



10.5 



88 



4,400 



4,000 



3,300 



259 



235 



194 



18 



37 



195 



11.1 



92 



4,575 



4,900 



4,100 



254 



272 



228 



19 



40 



178 



11.7 



95 



4,750 



5,800 



4,900 



250 



305 



258 



20 



43 



163 



12.3 



97 



4,900 



6,600 



5, 700 



245 



330 



285 



21 



45 



150 



12.8 



100 



5,025 



7,600 



6,500 



239 



362 



310 



22 



47 



140 



13.4 



102 



5,125 



8,600 



7,500 



233 



391 



341 



23 



49 



130 



13.9 



104 



5,250 



9,6G0 



8,400 



228 



417 



365 



24 



50 



121 



14.5 



x06 



5,350 



10, 700 



9,500 



223 



446 



396 



25 



52 



114 



15.0 



108 



5,450 



11, 900 



10, 700 



218 



476 



428 



26 



53 



106 



15.5 



109 



5,525 



13,200 



12, 000 



213 



508 



462 



27 



54 



99 



16.0 



111 



5,600 



14, 700 



13, 400 



207 



544 



496 



28 



55 



92 



16.5 



112 



5,675 



16, 300 



15, 100 



203 



582 



540 



29 



55 



86 



.16.9 



114 



5,750 



18, 100 



17, 100 



198 



624 



590 



30 



55 



80 



17.4 



115 



5,825 



20, 300 



19, 200 



194 



677 



640 



31 



55 



75 



17.9 



116 



5,875 



22, 700 



21, 400 



190 



732 



690 



32 



55 



70 



18.3 



117 



5,950 



24, 900 



23, 500 



186 



778 



734 



33 



55 



66 



18.8 



119 



6,025 



26, 800 



25,300 



183 



812 



767 



34 



54 



62 



19.3 



120 



6,075 



28, 300 



26, 600 



179 



832 



782 



35 



53 



59 



19.7 



121 



6,150 



29, 400 



27, 500 



176 



840 



786 



36 



52 



57 



20.2 



123 



6,200 



30, 100 



28, 200 



172 



836 



783 



37 



51 



53 



20.6 



124 



6,275 



30, 400 



28, 700 



170 



822 



776 



38 



50 



51 



21.1 



125 



6,325 



30, 700 



29, 100 



166 



808 



766 



39 



49 



50 



21.5 



126 



6,375 



30,900 



29, 300 



163 



792 



751 



40 



48 



49 



22.0 



127 



6,425 



31, 000 



29, 300 



161 



775 



733 



41 



46 



48 



22.4 



128 



6,475 



31,000 



29, *00 



158 



756 



717 



42 



45 



45 



22.9 



129 



6,525 



31, 100 



29, 500 



155 



740 



702 



43 



44 



44 



23.4 



130 



6,575 



31, 000 



29, 500 



153 



721 



686 



44 



43 



43 



23.8 



131 



6, 625 



31, 000 



29, oCO 



151 



705 



670 



45 



42 



42 



24.2 



132 



6,675 



30, 900 



29, oOO 



148 



687 



656 



46 



40 



40 



24.7 



133 



6,725 



30, 800 



29, 500 



146 



670 



641 



47 



38 



38 



25-1 



134 



6,775 



30, 700 



29, 500 



144 



653 



628 



48 



37 



37 



25.6 



135 



6,825 



30,600 



29, 500 



142 



638 



615 



49 



34 



34 



26.0 



136 



6,875 



30, 500 



29, 500 



140 



622 



602 



50 



32 



32 



26.5 



136 



6,900 



30, 300 



29, 400 



138 



606 



. 588 



Similarly, the current annual production in cubic feet or cords 

 per acre culminates at the age of 12 years, at which time approx- 

 imately 500 cubic feet per acre annually is being produced. The 

 average annual growth, however, continues to increase up to 16 years, 

 when it attains 255 cubic feet per year, against only 221 cubic feet 

 at 12 years. Tt is plain, therefore, that if the object of growing cot- 

 tonwood is to produce the maximum amount of solid wood per acre 

 per year, a rotation of approximately 16 years will give the desired 

 results. The reason why the average annual growth in board feet 

 per acre culminates later than the average annual production in cubic 

 feet is because the board-foot production does not begin until the 



