40 



MASS. EXPERIMENT STATION BULLETIN 209. 



plots. Roxl)ury Russet is larger than Baldwin on the muriate j)lot, and 

 the opposite is true on the sulfate plot, the differences here being quite 

 marked and increasing with the age of the trees. 



On the manure plot Rhode Island Greening has gained on the other 

 varieties, which may be due to the fact that it is the outside row with 

 free exposure to the north. On the ashes plot no relative change of the 

 four varieties appears. On the check plot Baldwin has gone ahead of 

 Roxbury Russet during the period of strip cultivation. Gravenstein has 

 increased its lead over the other varieties, especially during strip cultiva- 

 tion. On the sulfate plot Gravenstein has gone ahead of Baldwin during 

 the strip cultivation period, while the other varieties have maintained verj-^ 

 much the same relative positions. 



While there seem to be some ciuite marked varietal dilTerences in growth, 

 notably in the Baldwin and Russet on the two potash plots, it would be 

 unsafe to conclude that they are due to the fertilizer treatments. Thej^ 

 may be in part, but it is more likely that disease, natural soil differences, 

 or inherent differences in the stocks used may be responsible. 



Yield Records. 

 In Table 1 are given the total yields by plots and b}- varieties for the 

 periods wiien no cultivation was practiced, and for the later period of 

 strip cultivation. 



