6 CONTROL SERIES No. 90 



The three plant food elements were furnished in the following proportions 

 by the mixed fertilizers and the unmixed materials, including the pulverized 

 manures: nitrogen, 61 percent from mixed and 39 percent from unmixed; 

 phosphoric acid, 63 percent from mixed and 37 percent from unmixed; potash, 

 80 percent from mixed and 20 percent from unmixed. 



The tables present tonnage figures for one year, July 1, 1936, to July 1, 1937, 

 for both mixed fertilizers and unmixed fertilizer materials. In case of the 

 mixed fertilizers, the grade represents the plant food guarantee and is expressed 

 in the order of nitrogen, available phosphoric acid, potash. 



Tonnage of Mixed Fertilizers 



Complete Fertilizers 



J I Percent or More of Available Plant Food [Nitrogen, Available Phosphoric 

 Acid and Potash) 



Less than IJf Percent of Available Plant Food {Nitrogen, Available Phosphoric 

 Acid and Potash) 



5-3-5 

 4-3-1 

 4-2-2 

 3-3-3 

 4-6-3 



637 

 176 

 30 

 16 

 15 



5-6-2 

 3-3-2 

 Miscellaneous 



Superphosphate with Potash 



