98 THE AMERICAN APPLE ORCHARD 



used with caution. The figures in this, as in all other 

 formulas here given, represent the amounts to be given 

 annually for each acre. 



Dr. L. L. Van Slyke of Geneva, N. Y., recommends 

 the following formula: 



Cottonseed meal 100 pounds 



Raw ground bone 100 pounds 



Acid phosphate 100 pounds 



Muriate of potash 100 pounds 



Dr. E. B. Voorhees of New Jersey, in his work on 

 fertilizers, recommends the following: 



Raw ground bone 400 pounds 



Acid phosphate 400 .pounds 



Muriate of potash 400 pounds 



A glance will show that the last formula represents 

 a considerably larger amount of plant food than the 

 preceding formula. This may be due to somewhat dif- 

 ferent conditions held in view hy the two eminent gen- 

 tlemen quoted. The quantities of plant food to be 

 given will obviously vary between wide limits. Fertile 

 soils will require less than poor soils. Young orchards 

 will use less than old ones. Then if truck crops are 

 grown between the young apple trees the needs of 

 these crops have to be considered. 



