Feb.. 1927] PROGRESS OF AGRICULTURAL EXPERIMENTS 



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Table VIII — Influence of late fertilization with nitrogen on fruit hud formation 



figure a regression coefficient may be calculated and a corrected value 

 obtained for the expected size of fruit considering the crop. This figure 

 represents an a\'erage for the whole group as modified by the weight of 

 crop for each individual tree. 



Comi)aring the actual size of fruits with that expected, it may be 

 noted that the fmits on the trees fertilized in spring only are 0.0.3 

 ounce smaller than expected, while those fertilized both in spring and 

 in the late sunnner average 0.06 ounce larger. This difference is too 

 small to be significant when considered in relation to the probable error. 

 Within the accuracy with which this measurement was made, therefore, 

 the late fertilizer has not appreciably increased the size of the apples. 



No counts were made of the relative per cent of blooms setting fruit 

 in each of the two plots; but because the fruit bud formation was 

 approximately the same and the size of the fruits was not materially 

 difTerent, the increased crop on the trees receiving late fertilizer must 

 have been due to a better set. 



The original data for about 25 Baldwin and 8 Mcintosh trees in 

 Temple, N. H., have been taken but have not as yet been summarized. 



Winter Injury of Apples — (Adams Fund) 



Owing to increased activity in other fruit investigations, the winter 

 injury project has been inactive during the present fiscal year. The 

 material for histological study of injury in the tissues of apple seed- 

 lings, following subjection to various degrees of cold, is on hand, and 

 the work will be resumed later. 



