10 BULLETIN 820, U. S. DEPARTMENT OF AGRICULTURE. 
TaBLE 1.—Rate of growth in diameter and height of jack pine, in dense stands and of 
isolated or nearly tsolated trees, in Hubbard County, Minn. 
Isolated or nearly iso- 
Trees in dense stands 18 to 99 years old. lated trees 22 to 82 
years old. 
Age y 
* Average. Maximum, Average growth. 
1S Ae Height. . bE Height. D.b.h.| Height. 
Years. TRchres i  Rcee Ss Feet. Inches. Feet. 
1A) FEN iy re ri Meh Lee 12 1.8 19 ee 12 
a Se tare eee eae SRS 2.3 3.8 26 3.0 22 
Dee oa WAI Nee eerie Sinpiyeg tears Ee SE 33 i 1 29 
Das Fini o Seer oe eae 4.0 6. 9 38 6.6 35 
BENE er Noe aimee er Sea fae 4.6 7.9 42 7.9 39 
DOTS ee ee Se a a Sak 8.8 46 9.1 42 
Ai Te. SG Santos hee eer 5.6 9.5 50 10. 2 44 
BO a oe) so a 6.5 10. 2 53 ile 46 
Ed AO eee emilee bis Bi 6.5 10. 9 56 11.8 47 
DOs ole Due Bee eee 6. 9 EE. 5 59 12.5 47 
GOSS Saebrs eees S %3 #2. £ 62 13.1 48 
GOES Jase oe ae ee 7.6 EXT 65 13.7 49 
Wee oee sone ae ee 8.0 sid: 68 14.2 49 
Ue ae OS 8.3 13.9 70 14.8 59 
SOE ee ees 8.7 14.5 72 11. 8 59 
Based on 604 trees, 18 to 99 years old. Measurements by H. H,. Chapman. 
Table 1 indicates a much faster diameter growth of isolated and 
partly isolated trees than the average growth of trees in dense 
stands—faster even than the average growth of predominant trees in 
such stands. 
TABLE 2.—Rate of growth in diameter and height of jack pine in Cass County, Minn. 
Average. Maximum. Average. Maximum. 
Age. | Diameter Diameter Age. | Diameter Diameter 
breast | Height. | breast Height. breast | Height. | breast | Height. 
high. high. high. igh. 
Years. Inches. Feet. Inches. Feet. Years. Inches. Feet. Inches. Feet. 
Repoooonollanssoceses Sislterister aces 12 Goon ee 8.4 63 uta 72 
OM aa ee 0.6 10 1.4 20 Oise 8.8 65 11.6 74 
a arraree 1.5 16 2.8 28 (LD Sees 9.2 68 12.1 76 
20a aeeioe 2.4 23 4.1 35 S0Sarace 9.6 70 12.6 7 
25 ee eer 3533 30 58} 41 Shen 10.0 Cal 13.0 80 
Si) pa ee 4.2 35 6.3 47 90. SF 10.4 73 13.4 82 
BB eeuis 5.0 40 eo 52 OF: 10.8 74 13.8 83 
AOR G Sees al 45 8.1 Hifenl| EOO Seer RD 75 14.2 85 
Aly eee aes 6.3 50 8.8 GE) 1 Ue ee 11.6 76 14.6 86 
153) Paras ae ae 6.9 53 9.5 64s ROR 11.9 77 15.1 88 
Ne re 7.4 7 10.1 67G||UOaaete 158: 7 55 89 
GORA se 7.9 60 10.6 7 120 eee 12.6 79 15.9 90 
1 
Based on 52 trees 69 to 124, averaging 93 years old, and 7 to 16 inches in diameter, the trees having been 
cut for saw logs. Measurements by J. St. J. Benediet. 
