24 



BULLETIN 139, U. S. DEPARTMENT OF AGRICULTURE. 



It is an interesting fact that a Norway pine tree which has been 

 stunted for from 30 to 50 years, if it recovers, adds that period to its 

 normal life. This behavior has also been noticed in the case of tama- 

 rack and the giant sequoias of California. Table 15 gives some 

 interesting figures of increment for 8 sample plots measured in pole 

 stands. The volumes are computed to a 2-inch merchantable diam- 

 eter on the basis of the average tree for each diameter class. 



Table 15. 1 — Yield per acre of fully stocked sapling and pole stands on good-quality soil. 



Age of stand years. 



Average diameter 1 >reast-high . inches . 



Average total height feet. 



Total number of trees per acre 



Volume at present cubic feet. 



Volume 5 years ago do. . . 



Total increment last 5 years 



Annual increment last'5 years 



Average annual increment.. cubic ft. 



Volume at present cords. 



Volume 5 years ago do. . . 



Total increment last 5 years 



Annual increment last 5 years 



Average annual increment cords. 



Volume at present board feet. 



Volume 5 years ago do... 



Total increment last 5 years 



Annual increment last 5 years 



Average annual increment., board ft. 



Serial No. of plot. 



1 



2 



3 



4 



5 



6 



7 



8 



Location. 



Re- 

 lease. 



Grand 

 Rapids. 



Men- 

 ahga. 



Black- Clo- 

 berry. quet. 



Itasca 

 Park. 



Shev- 

 lin. 



Itasca 

 Park. 



Soil. 



Sand. 



10J 



1,720 



145 



1,015 



Sandy 

 loam. 



15 



34 



224 



2,616 



1,235 



121 



1,114 



223 



82 



17.3 

 1.6 

 15.5 



1.3 



S,645 



849 



7,798 



1,560 



643 



Sandy 

 clay. 



15 

 34 

 16J 

 713 

 272 

 55 

 217 

 44 

 18 



3.8 



0.8 



3 



0.25 



1,912 

 383 



1,519 

 302 

 126 



Sandy 

 clay. 



Sandy 

 clay. 



17 

 4 



20 

 778 

 548 



74 

 474 



95 



32 



27 



5 



29 



1,512 



1,368 



647 



721 



140 



50 



7.7 

 1.2 

 6.5 

 1.3 



19.1 



9.1 



10 



2 



0.7 



3,840 

 525 



3,318 

 665 

 224 



9,581 

 4,530 

 5,047 



Sandy 

 clay. 



27 

 5 

 21 

 874 

 1,085 

 548 

 537 

 107 



15.2 

 7.6 

 7.6 

 1.5 



0.56 



Sandy 

 clay. 



41 

 44 

 40 

 616 

 990 

 455 

 535 

 107 

 24 



14 



6.3 



7.7 



1.5 



0.34 



7,595 



3,838 



3,757 



751 



281 



6,934 



3,187 



3,745 



749 



169 



Sandy 

 clay. 



79 



84 



69 



524 



5,534 



4,62 



919 



184 



73 



79.5 



64.6 



14.9 



3 



1 



39, 735 



32,332 



7,403 



1,580 



503 



The figures in the table would indicate a remarkably rapid growth. 

 On the whole, however, it is clear that upon poor soils, and with the 

 comparatively cool and short growing season, rapid growth and heavy 

 yields can not be expected at an early age. The returns from either 

 plantations or natural stands inside of 40 years will be negligible, yet 

 in the end the species not only exceeds in the capacity for timber 

 production any other species adapted to sandy soils in the North, 

 but equals and probably exceeds in yield per acre the Scotch pine 

 grown on similar soils in Europe. If such growth is possible in the 

 more northern latitudes, and on the sandier soils, it should produce 

 yields equal to or exceeding those of white pine at the southern 



1 Furnished by William T. Cox, State forester of Minnesota. 



