CONTROL SERIES No. 51 



(a) Tonnage of Mixed Fertilizers. 



Complete Fertilizers. 



High-Analysis {I4 per cent or more of Nitrogen, Available Phosphoric Acid 



and Potash.) 



Low-Analysis {less than I4 per cent of Nitrogen, Available Phosphoric Acid 



and Potash.) 



Ammoniated Superphosphates and 

 Superphosphates with Potash 



(a) Grade is expressed in terms] of nitrogen, ammonia (figures in [parenthesis), available 

 phoapharic acid, and potash. • 



