JACK PINE. 



15 



those plots are compared as to cubic-foot yield with those in IIul)])ard 

 County (Table 9), and the site quality averages "poor." One plot 

 at Cloquet, Minn., ranks somewhat liigher than that given under 

 site quality "good" in the Hubbard County yield table. 



Tabi,e 11. — Yield per acre of six sample plots in dense, even-aged stands of jack pine on 

 sandy soil in northern Minnesota.^ 



Plot 1, 



Clociuct, 



ago 13 



yuars. 



Plot 2, 



Cloquet, 



aKc 37 



years. 



I'lot 3, 



Park 



Rapids, 



age 3y 



years. 



Plot 4, 

 Ferris, 

 age 40 

 years. 



Plot 5^ 



Bemiilji, 



age 02 



years. 



Plot fi. 



Cass Lalce, 



age (ifj 



years. 



Total number of trees 



Average diameter breast high, 



inches 



Average totalhoight feet. . 



Yield per acre cubic feet. . 



Yield per acre cords. . 



Yield per aero board feet. . 



Quality of site 



Average annual increment, 



cubic feet 



Average annual increment, 



cords 



Average annual increment, 



boaid feet 



10, 464 



1.5 



16 



282.53 



3.95 



1,978 

 2 Poor. 



21.6 



3 



152 



586 



6.5 



48.5 



3,142.68 



44 



21,999 



a Good. 



85 



1.19 



593 



800 



5.4 



44 



1,989 



27.8 



13,925 



2 Poor. 



51 



0.7 



357 



460 



5 



48.5 



984.4 



13.78 



6,891 



2 Very poor. 



24.6 



0.34 



172 



180 



10 



67 



2,481 



34.7 



17,367 



2 Poor. 



40 



0.56 



280 



252 



9 



70.5 



3,102 



43.43 



21,715 



2 Poor. 



47 



0.66 



1 From data collected and computed by the Minnesota Forest Service in 1913. 



2 Compared with cubic-foot yields in Hubbard County, Minn. See Table 9. 



Table 12 shows the growth and yield of 12 plots in typical stands 

 in Adams County, Wis., on sandy soils covered with pure stands of 

 jack pine. Under the heading, "Quality of site," these plots are 

 compared as to cubic-foot yield with those in the Hubbard County 

 yield table (Table 9), and the site quality easily averages "good," 

 some of the plots rankuig much higher than the site designated as 

 "good" in Table 9. 



Table 12. — Stand and yield per acre of 12 sample plots in dense, even-aged stands of 

 jack pine on sandy soil in Adams County, Wis. 





Living trees per acre. 



Average. 







2 



2 

 







1 



Jack pine. 



Other species. 



4.3 CO 



l.g 



q 



i 

 s 





Quality of 

 site.i 



Age of plot. 



i 



o 



1 

 P 



r-i 



B 



o 



a 

 ./-I 



en 

 p 



•a 

 a 



C3 



•a > 

 o 



-3 



•si 



a 



03 

 CO u 



1° 



U3 



Years. 

 23, 



530 

 950 

 390 

 400 

 490 

 416 

 410 

 336 

 408 

 560 

 330 

 300 



280 

 460 

 250 

 300 

 370 

 344 

 310 

 272 

 304 

 260 

 200 

 190 











5.6 

 5.9 

 7.6 

 8.0 

 7.5 

 7.5 

 7.3 

 7.9 

 7.5 

 6.4 

 8.8 

 8.6 



Feet. 

 32 

 42 

 45 

 46 

 48 

 49 

 50 

 50 

 53 

 38 

 50 

 60 



Sq. ft. 



62 

 114 



96 

 127 

 131 

 113 

 101 

 113 

 110 



73 

 120 

 114 



Sq. ft. 



48 



88 



87 



125 



127 



109 



96 



113 



104 



59 



118 



113 



Cu. ft. 

 949 

 2,337 

 1,995 

 2,971 

 3, 0S5 

 2, 5.M 

 2,465 

 2,572 

 2,686 

 1,352 

 2,834 

 3,310 



Good. 



25 



"'so' 



60 

 40 

 8 

 20 

 56 

 32 



■"so' 



90 



10 

 110 



200 

 70 



184 

 60 

 24 

 16 



240 



130 

 30 







Very good +. 

 Good +. 



31 



20 





32 



Very good. 

 Do. 



32 







34 



24 



50 





Good + . 

 Good — . 



36 



40 



Good — . 



41 . 



24 

 30 

 40 

 40 





Good 



50 



Very poor. 



Poor +. 

 Good 



50.. 



50 







1 Compared with cubic-foot yields in Hubbard County, Minn. See Table 9. 

 Measurements by the author, 1917. 



