24 



BULLETIN 933, U. S. DEPARTMENT OF AGRICULTURE. 



(18) Six stumps at Valley Falls, Kans., in the bottom lands of Delaware 

 Creek. Averaged 25 inches in diameter, stump height, at 64 years ; also 

 above the average rate of growth. 



(19) Five sturups in northern Delaware. Averaged 25 inches in diameter, 

 stump height, at 94 years. 



(20) One hundred 20-inch logs taken at random in Missouri, Iowa, and 

 Kansas. Averaged S3 years of age at the top end. Logs of this size measured 

 in Indiana and Ohio were 81 years of age. These figures would apparently 

 indicate that the rate of diameter growth of walnut is about the same in the 

 river-botton* woodlands of the prairie States as it is farther east. 



Table 4. 



-Examples of diameter growth of black walnut based on age described 

 under the corresponding numbers on page 23. 





Grown in — 



Age (years). 



No. 



10 



20 



30 



40 



50 



60 



70 



80 



90 



100 



110 



120 



130 



140 150 





Diameter at breastheight (inches). 







0.2 

 1.4 



.6 



.6 

 1.0 

 1.7 

 1.4 

 1.4 

 2.4 

 4.1 



.4 

 2.0 



.9 

 2.0 

 1.4 



.8 



1.4 

 5.4 

 3.1 

 3.1 



4.9 

 7.0 

 4.4 

 5.3 

 6.4 

 10.2 

 3.1 

 6.4 

 4.4 

 7.5 

 5.8 

 7.1 



3.6 

 10.2 

 5.4 

 5.4 

 9.1 

 12.6 

 7.4 

 8.1 

 10.7 

 15.0 

 6.2 

 10.6 

 7.4 

 13.1 

 10.2 

 13.0 



6.5 



14.8 

 8.0 

 8.5 

 12.6 

 16.1 

 10.7 

 10.8 

 15.0 

 18.3 

 9.6 

 14.6 

 11.8 

 18.1 

 14.0 

 17.5 



12.1 



18.8 

 10.8 

 11.8 

 14.6 

 18.8 

 13.5 

 13.5 

 18.3 

 20.4 

 12.9 

 17.6 

 16.0 

 22.0 

 17.4 

 20.6 



16.1 

 22.3 

 12.9 

 15.0 

 17.0 

 20.6 

 15.8 

 16.6 

 21.4 



19.5 

 24.6 

 15.2 



17.8 

 19.4 

 22.0 

 18.0 

 19.6 

 24.0 



21.4 

















1 



\Open 



















17.2 

 20.5 

 20.5 

 23.3 

 19.6 



19.1 

 22.8 



20.8 

 24.9 



22.4 

 26.6 











2 



\Open 











? 



(i) 











4 



(i) 



23.5 

 21.4 















5 

 fi 



( l ) 



(i) 



23.3 



24.3 



25.6 



26.8 



28.0 



29.3 



7 



(i) 



26.3 



28.0 















8 



0) 



(1) 















q 



16.4 

 21.0 

 20.5 

 25.0 

 20.0 

 23.4 



19.2 

 24.0 

 24.3 



21.9 

 25.7 



23.9 















in 



(i) 















T1 



(1) 

















1' 



(1) 



















n 



(1) 



22.3 

 24.0 



24.2 

 24.6 

















11 



I 1 )-.- 



































1 See description on p. 23. 



VOLUME GROWTH. 



As the growth of a tree in volume depends upon the rate of growth 

 in both diameter and height, it is more variable than either. A 

 statement of the increment in board feet to be expected at the end 

 of any period will consequently have little bearing upon any par- 

 ticular stand. In order, however, to present a general idea of the 

 average volume growth of individual trees, Table 5 has been pre- 

 pared. It indicates fairly well the volume growth in groves in the 

 Ohio Valley, but does not apply to single trees or rows grown in 

 the open, to forest-grown trees, particular^ in the eastern part of the 

 range, or to trees in artificial plantations. It is less applicable to 

 groves in regions east or west of the Ohio Valley. 



It is evident from this table that walnut may be grown most 

 advantageously, from the standpoint of greatest continuous volume 

 production, on long rotations, for the reason that both the average 

 annual growth and the current annual growth continue to increase up 



