52 THE APPLE 



is used not oftener than once in three, four, or five years during 

 the first twelve or fifteen years of the tree's life, better results will, 

 as a rule, be obtained. 



After trees have passed twenty years of life in an orchard, there 

 seems to be greater need of the stimulating effects of the nitrogen 

 contained in manure. Very old trees and trees that have been 

 neglected seem to respond quickly to the invigorating effect of 

 plenty of manure plowed under. Many horticulturists therefore 

 strongly recommend that one of the first steps in the renovation 

 of neglected apple trees should be the plowing under of from 

 i o to 40 tons per acre of stable manure. 



