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CONTROL SERIES No. 54 

 Summary of Deficiencies in Mixed Fertilizers. 



Serious Commercial Shortages in Mixed Fertilizers. 



Fewer serious commercial shortages were found this year than for any season 

 since 1927. Of the 322 brands analyzed, 214 or about 66.7 per cent showed no 

 deficiencies. Of the 963 j^lant food guarantees made, 87 jier cent were fully 

 maintained, a substantial improvement over the previous two years. The 

 deficiency table shows tlie following statistics: 



Deficienciesnot exceeding J4 of 1 per cent, 82. 



Deficiencies between 34 and 3^ of 1 per cent, 24. 



Deficiencies between J^ and ^ of 1 per cent, 7. 



Deficiencies more than % of 1 per cent, 11. 



On the basis of the total number of guarantees made, 11.84 per cent of the 

 nitrogen guarantees, 14.3 per cent of the available phosphoric acid guarantees, 

 and 12.8 per cent of the potash guarantees were not met. 



Thirty-one of the 38 nitrogen deficiencies, 25 of the 46 available phosphoric 

 acid deficiencies, and 26 of the 41 potash deficiencies did not exceed 34 of 1 per 

 cent. 



There were 5 less shortages in nitrogen, 5 less in available i)hos]ihoric acid, 

 and 1 more in potash, than in 1929. 



