14 BULLETIN 820, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 10.— Yield per acre of pure, even-aged, densely stocked stands of jack pine in Hubs 
bard County, Minn., calculated in cubic feet, cords, and board feet. 
SITE QUALITY “GOOD.” 
Yield per acre. 
Tees nese Milltally.4 _|Scribner Decimal C. 
Age. Trees 5 
inches ; 
and over. With Trees5 | Trees8 | Trees 8 | Trees 10 
anne Peeled.’ | inches inches inches inches 
: and over. | and over. | and over. | and over. 
Years. Cu. ft. Cords. Cords. \Board ft. | Board ft.| Board ft. | Board ft. 
SD (Be Re an a NIE ERS ee Se 160 6 163: DOO ck BOS SARE Ss ea eer aR ere 
OR i vee an cites Ce as ee eee 650 6.5 Das 3, 200 700 BQO eos 
SO. are og eee a! Ce Neg eee 1,360 13.6 11.2 6, 900 1,900 LOO: eee 
Bs) Sele SUNN Stine ote it RR A 2,210 22-1 18.2 10, 500 3, 200 1,400 300 
EG. CUR SORE es 2,300 | 28.0 23.1 | 43,200 | 4'700 | 27300 | 1,300 
AD oats So ON es eee ae oe 3,160 31.6 26.1 14, 900 6, 500 3, 800 2,200 
ees Se AY MER eee en pe 3, 420 34.2 28.3 16, 300 8, 600 5, 200 2, 900 
Bly co aree Ann ape = Re ee eta Oe op 3, 640 36.4 30.1 17, 400 10, 700 6, 200 3,400 
GO ae Se Ee Oa Pata rere 3,840 | 38. 4 31.8 18,500 12,500 6, 900 4, 000 
(SS ee cepa Ser Symi fen ee Ae ete 4,010 40.1 33.3 19, 600 14, 000 7,600 4,400 
7A Vi ee a eee tm eles TO ia 4,180 41.8 34.7 20, 600 15,300 8,200 | 4,800 
| 
SEE OWA ERYS “POOR Z2 
VAs, Uke weedeat Aaah Gane ee ely 130 ine iil TAG st eer ae frees Se Na ra | Bie OMe ee Ta 
B (ieee ee Oo eee eee 470 4.7 3.8 PaSCA A NE Wiese Me Aone Pca Stee aren ee 
SY igs ae mata ative ee Mam tere eho 870 8.7 rect 4000 se 3 Reo Se Slee ea ee eee 
PA () eit es epee cet uN) See een 1,300 13.0 10.6 6, 200 PAU URE bapa een eee eae 
CLUS Yicas gt ese ARNO pe LE 1,670 16.7 187 8, 100 1,106 400 | Ee Sa eaiae a 
D0 Eee ee Saha ha AoE ae ee Ce 1,990 19.9 16.3 9, 600 2, 200 S00 |aateeae 
EL orb Sean ey ci eae 2, 280 22.8 18.7 | 10,900 3,400 1,500 300 
7 ep ge Nee mute trees ghee 2,550 25.5 21.0 | 12,200 4, 900 2,500 1, 000 
GOR Sr ie ie swe a ra aul ee 2,790 27.9 23.0 13, 400 6, 600 3,800 1,600 
POs Se eee ee eee ne Saat 3, 010 30.1 24.9 14,500 8, 200 4,900 2, 100 
1 Total volume of stem, including bark. 
2100 cubic feet equal 1 cord. 
3 Per cent of bark in total volume, 18.9 down to 16.9, decreasing with increase in age. 
4Scaled by white-pine mill-cut table. See Table 27, in appendix. 
6 Stump height, 1 foot; diameter inside bark at top, 5.5 inches, scaled by Table 25 (appendix). 
Based on plots given in Tables 34 and 35 in the appendix. 
In these tables ‘‘good”’ quality of site indicates the better classes 
of soils which would be suitable for growing Norway pine, while 
‘‘poor’’ quality indicates those soils not so well adapted to Norway 
pine. 
Tables 34 and 35 (appendix) give the details of the field measure- 
ments of the plots used as the basis of Tables 9 and 10. All of these 
plots were used as a basis for determining the total cubic volume. 
The items other than total cubic volume were based on selected plots 
classified as qualities ‘‘good”’ and “‘poor”’ on the basis of their total 
cubic yield. This classification corresponds closely to a classification 
based on the average dominant heights of the different plots. (See 
fic. 3, facing p. 16.) The plots selected were those whose total cubic 
volumes were close to the average curves for total cubic volumes. 
Table 11 shows the growth and yield of six plots at different pomts 
in northern Minnesota, the data having been collected and computed 
by State Forester Cox. Under the heading, ‘‘Quality of site,” 
