FOOD FOR PLANTS 



149 



Mature trees should receive from 5 to 10 lbs. of Ni- 

 trate of Soda per tree. The proper amount to apply 

 will depend on the natural fertility of the soil, the 

 system of culture, the age, size and variety of the 

 trees. In general, the mature tree should make a 

 terminal growth of 6 to 10 inches." 



Trees from Nitrated Row in Stewart Plots at Pennsylvania 

 State College. 



At the Ohio Station * large increases were pro- 

 cured from applications of Nitrate to neglected 

 orchards in sod : 



1. Nitrogen was the only element of fertility 

 which was of direct benefit to the apple trees them- 

 selves from the standpoint of fruitfulness and vigor. 



Ohio Agr. Exp. Sta. Mo. Bui., Vol. IV., No. 1. 



