HOW HEAVILY TREES SHOULD BE PRUNED 227 



TABLE 36 



Effect of Severity of Pruning on Size and Yield of Apple Trees 

 Growth measurements made at 9 years from planting. 

 Yields are totals per tree for the 9-year period. 





Average Size of Trees 







±1 ULLi^ 



V^XX v> LI J 1 1 







Yield 



Variety and Pruning Treatment 



Tree 



Tree 



per Tree 





ference 



Spread 



Height 







'i.Ti.rh.p.a 





feet 



bushels 



Duchess (Oldenburg): 













14.2 



13.8 



16,3 



2.9 





13.7 



13.3 



17.0 



1.7 





12.2 



11.4 



15.5 



1.1 



Grimes: 















15 3 





4.4 





15.1 



14.8 



16.4 



4.9 





15.6 



16.3 



16.0 



3.1 



Baldwin: 













17 7 



17 6 



15 6 



XO . \J 



1.8 





17.6 



16.5 



16.2 



0.5 





16.7 



15.4 



14.6 



0.4 



Stayman: 













±\J . o 



20 Q 



17 4 



XI . t: 



3.7 





16.4 



19.7 



17.2 



2.8 





15.0 



18. 5 



lo.o 



1.8 



iNortneru opy. 













17.3 



14.9 



17.9 



0 





15.7 



12.4 



16.6 



0 





14.1 



11.4 



15.4 



0 



Average of all varieties: 













16.3 



16.5 



16.8 



2.6 





15.7 



15.3 



16.7 



2.0 





14.7 



14.6 



15.6 



1.3 



