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CONTROL SERIES No. 60 



Summary of Deficiencies in Mixed Fertilizers 



Serious Commercial Shortages in Mixed Fertilizers 



Of the 303 brands analyzed, 235, or 77.5 per cent, showed no deficiencies. 

 Out of 906 plant food guarantees made, 92 per cent were fully maintained. 

 The deficiency table shows the following statistics: 



Deficiencies not exceeding M of 1 per cent, 40. 



Deficiencies between % and 3^ of 1 per cent, 20. 



Deficiencies between y2 and % of 1 per cent, 8. 



Deficiencies more than % of 1 per cent, 9. 



Of the total number of guarantees of each element made, 6 per cent of 

 the nitrogen, 8.9 per cent of the available phosphoric acid, and 10.6 per cent 

 of the potash were not met. Ten of the 18 nitrogen deficiencies, 9 of the 27 

 available phosphoric acid deficiencies, and 21 of the 32 potash deficiencies, 

 did not exceed 3^ of 1 per cent. 



There were 5 less shortages in nitrogen, 30 less in available phosphoric 

 acid, and 17 less in potash, than in 1931. 



Mixing Efficiency Table. 



