STATE POMOLOGICAL SOCIETY. II9 



case being shown by the tilled trees of Experiment 219. The 

 benefits from fertilization, therefore, are by no means confined 

 to untilled trees, and in some cases its utilization is evidently 

 better when accompanied by some cultivation. 



The exact conditions associated with these different kinds of 

 response have not yet been determined, and this is one of the 

 important questions intended for further study, by chemical 

 and physical means, as soon as the necessary facilities are avail- 

 able. 



THE RELATIVE IMPORTANCE OF FERTILIZATION AND CULTURAL 



METHODS. 



Throughout these experiments, and especially in the older 

 orchards, the importance of fertilization has been quite appar- 

 ent. In most of the results from Table V on, it will be observed 

 that the addition of fertilization, either in manure or in com- 

 mercial form, has largely overcome or neutralized the differ- 

 ences, developed by the various cultural methods when used 

 alone. In some cases, also, it has even distinctly reversed the 

 latter differences. Similar, though not exactly analogous data, 

 bearing on the same general question, may be obtained from 

 the Johnston experiment by comparing the yields produced on 

 its cultural-method plats with those obtained on certain of its 

 plats receiving fertilization. 



The figures resulting from this comparison are shown in 

 Table XIII. As already noted in connection with Table IX, 

 the cultural-method plats in this experiment have received one 

 uniform application of fertihzer, the application being made in 

 191 1. This has not yet influenced the yields very materially, 

 with the possible exception of the mulched trees in 1912, but 

 the annual differences for the three preceding years are also 

 given, thus permitting any further comparison that may be 

 desired. The sod here is not especially heavy, owing to the 

 practically complete occupation of the ground by the trees. 



