80 



POMOLOGY 



Table IX 



RESULTS ON GROWTH OF LIGHT AND HEAVY PRUNING OF YOUNG APPLE 



TREES (stark) 



The same observation has been made with regard to bear- 

 ing trees. ^ After twelve years' work with dwarf apples (the 

 trees were then fifteen years old), they were lifted and 

 weighed, with the following observations : "Those which had 

 not been primed at all were 20 per cent heavier than those 

 which had been moderately pruned, while those which had 

 been hard-pruned were 16 per cent lighter . . . thus pruning 

 not only doesn't increase the actual size of the tree, but it 

 results in less new wood being formed." 



Tufts - shows that there is a definite correlation between 

 trunk circumference and the weight of both top and root 

 development of two-year-old black walnut and almond 

 seedlings. Also that the average increase in circumference of 

 severely pruned apricot, cherry, peach, pear, and plum during 

 four seasons was 8.9 centimeters, moderately pruned 10 9, 

 and lightly pruned 12.3. The latter developed stockier and 

 stronger branches and made greater development than 

 heavily pruned trees. 



Gardner ^ also points out that unpruned young trees, on the 

 average, increased in size as rapidly or more so than either 

 dormant or summer pruned ones. 



1 Bedford and Pickering. Woburn Exp. Fruit Farm, 7th Rept. 



2 Tufts, W. P. Calif. Agr. Exp. Sta. Bull. 313. 1919. 



3 Ore. Agr. Exp. Sta. Bull. 139. Pages 3-45. 1916. 



1907. 



