.4 



148 ^5 



5^ 



POMOLOGY 



(^f^p^SJgSrVI.) The following figures show the results ob- 

 iea*m one orchard: 



1^» Table XXXII 



RESULTS OF FERTILIZERS ON YIELD OF MULCH (AFTER BALLOU) 



129. Clean cultivation has never been widely used in the 

 eastern United States, but in sections of the Northwest 

 and in California it has been followed extensively. The 

 danger of clean tillage seems to be in its ultimate effect on 

 the soil itself. Especially is this true in sections in which 

 there is a long growing season and the summer sun is intense.^ 

 In the West it has been found that shade or cover-crops 

 are desirable to shade the ground, thus protecting the soil 

 flora and also maintaining the organic matter in the soil. 

 While this system may and often does give satisfactory 

 results for a period of years, it is likely to end in a premature 

 decline of the trees and a decrease in size of the fruit. This 

 would depend on the climate, the nature of the soil, and its 

 fertility. 



130. Tillage and cover-crop system. — From the stand- 

 point of growth and yield of the trees, this system doubtless 



' Paddock, W., and O. B. Whipple. Fruit-Growing in Arid Regions. 

 New York. 1910. Ch. 11. 



