CONTROL SERIES No. 54 



(a) Tonnage of Mixed Fertilizers. 



Complete Fertilizers. 



High-Annlysis {I4 per cent or more of Niirogen, Available Phosphoric Acid 



and Potash.) 



Low-Analysis (less than 14 per cent of Nitrogen, Available Phosphoric Acid 



and Potash.) 



Ammoniated Superphosphates and 

 Superphosphates with Potash 



' Grade is expressed in terms of nitrogen (ammonia equivalent in parentheses), available phos- 

 phoric acid, and potash. 



