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CONTROL SERIES No. 74 



Summary of Deficiencies in Mixed Fertilizers 



Serious Commercial Shortages in Mixed Fertilizers 



Of the 260 brands analyzed, 186, or 72 per cent, showed no deficiencies. Out 

 of 778 plant food guarantees made, 90 per cent were fully maintained. 

 The deficiency table shows the following statistics: 

 Deficiencies not exceeding 34 of one per cent, 48. 

 Deficiencies between 34 and 3^ of one per cent, 20. 

 Deficiencies between 3^ and % of one per cent, 5. 

 Deficiencies more than % of one per cent, 8. 

 Of the total number of guarantees of each element made, 8 per cent of the 

 nitrogen, 8 per cent of the available phosphoric acid, and 14 per cent of the potash 

 were not met. Thirteen of the 22 nitrogen deficiencies, 11 of the 22 available 

 phosphoric acid deficiencies, and 24 of the 37 potash deficiencies did not exceed 

 }/i of one per cent. 



There were 6 more shortages in nitrogen, 19 less in available phosphoric acid, 

 and 7 less in potash, than in 1933. 



Mixing Efficiency Table. 



