JACK PINE. £5 
these plots are compared as to cubic-foot yield with those in Hubbard 
County (Table 9), and the site quality averages “‘poor.’’ One plot 
at Cloquet, Minn., ranks somewhat higher than that given under 
site quality ‘‘good”’ in the Hubbard County yield table. 
TABLE 11.— Yield per acre of six sample plots in dense, even-aged stands of jack pine on 
sandy soil in northern Minnesota. 
Plot 1, Plot 2, potas Plot 4, Plot 5, Plot 6 
Cloquet Cloquet 3 Ferris, Bemidji, | Cass Lake, 
age 13° age 37. Fepids, age 40 age 62 age 66 
years. years. ee years. years. years. 
Total number of trees.......-- 10, 464 586 800 460 180 252 
average diameter breast high, oe ae Aa . i ; 
CHESS acacia cae ; : 
Average total height......feet.. 16 48.5 44 48.5 67 70.5 
Yield per acre..-... cubic feet. . 282. 53 3, 142. 68 1, 989 984. 4 2,481 3, 102 
Yield per acre.-.....-.-- cords. . 3.95 44 27.8 13. 78 34.7 43. 43 
Yield peracre...... board feet. - 1,97 21,999 13, 925 6, 891 17, 367 PAA) 
Qualtiyeonswectscseece mas secs: 2 Poor. 2 Good. 2 Poor. |? Very poor. 2 Poor. 2 Poor. 
Average annual increment, 
Cubicteete ease Sweets 21.6 85 51 24.6 40 47 
Average annual increment, 
CONUS Spe See praiae Coen ta nies 3 1.19 0.7 0.34 0. 56 0.66 
Average annual inerement, 
POaRditeetweesee eee see ete: 152 593 307 172 280 330 
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 ranking 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. 
Basal area. 3 
i Yn 2 
Jack pine. Other species. 3 a is S 
a a 
| OD R i 
Age of plot. ais “ ss ilies Sh ane we aes a rs 3, eae y os 
© a 2) 5) a Ay ee q q se} ‘ 
Sele See ete a ee ie |e 
Soe ev ies Ween eid | oe | se |e 
Pe esta) RSS fae I SI SUS | Rare at ac f= a Geol PRPS 
a a = o| = a E S |x! | i) im a 
Se acne os eaisch anaes. |" | 3 
a Ney = 1D = fa) A ~ 12 <a 
Years Feet.| Sq. ft. | Sq. ft. | Cu. ft. 
DPN See OC BS OU e228 0nil eee eels fase ese eersleree ue 5.6 62 48 949 | Good. 
PT a es eh 950 AGU Ree eee Qe ese tsicrere tere 5.9 42 114 88 2,337 | Very good +. 
She eee 390 | 250 30 | 110 bale ayers 7.6 45 96 87 | 1,995 | Good +. 
Ae eee 400 | 300 GOs ee ZOO ee pees epee: 8.0 46 127 125 | 2,971 Very seed. 
Rohe ree 490 | 370 40 LON eratstets, sl | Cees TaD 48 131 127} 38,085 0. 
bee aes 416} 344 8| 184 Davie Fees aan 49 113 109} 2,550} Gooa +. 
Sib Se seo cee 410} 310 20 60 BOs eaease Toe 50 101 96 | 2,465 | Good —. 
Si ee See Ce 336 | 272 56 Pa RSA MC SE 7.9 50 113 113 | 2,572 | Good —. 
Ais ona 408 | 304 32 16 al aes (ee) 53 110 104 | 2,686 | Good —. 
7) Er ee ere 560 | 260 |.....- 240 SOFIE. a25- 6.4 38 73 59} 1,352 | Very poor. 
OO Race eee 330 | 200 80} 130 AGA eee sae 8.8 50 120 118 | 2,834} Poor +. 
7 aaa oat 300 | 190 90 30 40) \sccane 8.6 60 114 113 | 3,310} Good —. 
1 Compared with cubic-foot yields in Hubbard County, Minn. See Table 9. 
Measurements by the author, 1917. 
