FRUIT GROWING 67 



under a system of clean culture and irrigation 

 with the exhaustion of the nitrogen supply. The 

 remedy in these cases is a leguminous cover 

 crop turned under to take the place of clean 

 cultivation. For the Northwest vetch and the 

 clovers will undoubtedly give best results. In 

 the East vetch, crimson clover, and cow peas 

 are the great nitrogen restorers. 



The use of cover crops and other fertilizers 

 should be governed entirely by the growth and 

 fruitfulness of the tree. In some instances the 

 crops must be employed to maintain growth and 

 production. In other cases cultivation and cover 

 cropping must give place to grass in order to 

 check the growth and induce fruitfulness. At 

 this time it is only possible to call attention to 

 these troubles and the means of their control. 

 The success in applying the remedy is the meas- 

 ure of the skill of the orchardist. 



Spraying. No single factor of orchard 

 management is of greater importance than 

 spraying. Spraying has done more to place 

 apple culture on a safe basis than any other 

 single discovery of modern times. The use of 

 the spray is to the orchardist what the use of 

 the anesthetic is to the surgeon. It makes it 

 safe and certain. In no department of farm 

 practice has science demonstrated its value to a 



