SOILS AND FERTILIZERS 



487 



a Equals 1 per cent of phosphoric acid, 7.5 per cent of ammonia and 1 per cent of potash. 

 b Slaughterhouse tankage may be substituted for dried blood if, on the basis of the weight of 

 plant food contained, it is cheaper. 



Quantity and Composition of Fertilizer Mixtures Suggested for Fall 

 and Spring Applications to Each Acre of Wheat Grown on Vari- 

 ous Types of Soil. 



