152 



MASS. EXPERIMENT STATION BULLETIN 238 



weighed. The results are given in Table 2, which suniniarizes the weight of 

 aboift 300 trees. The unpruned trees weighed the most of all except in the cases 

 of Spy and Mcintosh, both free branching varieties. There are likewise two 

 exceptions to the prevailing result that the cut iiack trees are lighter than those 

 not cut back. I'iie central leader trees not cut back were heavy trees, a result 

 that appears in several other measures of growth. It sliould be noted that 

 these trees had in general rather less wood pruned off. 



Table 2. — Average Weight of Trees Removed, 1922 



If to the weight of the trees at digging is added the weight of the wood 

 pruned ofi' before 1922, the figures shown in Table 3 result^ Tiiis shows that 

 the headed trees generally weigh less than those not headed, yet the difference 

 is not great. The heaviest trees are the central leader not headed, which 

 slightly exceed the unpruned trees. 



Table 3. — Average Total Weight of ^\'ood Produced 



It has been shown' that there is no difference in height and spread of tlie 

 trees except in the case of the headed trees, whicli are somewhat smaller tlian 

 the others. 



The average weights of the different \arieties give an indication of the com- 

 parative vigor of these varieties. These differences are rather large. The 

 Mcintosh trees were heaviest, followed in order by Baldwin, Northern Spy, 

 Rhode Island Greening and SmokeJiouse taken together, and King. The King 

 trees were larger than their weight indicates, but owing to the porous nature 

 of the wood the trees are light in weight. 



The trunk diameters at a fixed point have been taken each year. Averages 

 for all tlie trees in 1921 and for those remaining in 1924 are given in Table 4. 



1 3Iass. Agr. Expt. Sta. Bui. 226 p. 25, 1926. 



