10 



CONTROL SERIES No. 81 



Serious Commercial Shortages in Mixed Fertilizers. 



Of the 288 brands analyzed, 237, or 82 per cent, showed no deficiencies. Out 

 of 887 plant food guarantees made, 93 per cent were fully maintained. 

 The deficiency table shows the following statistics: 



Deficiencies not exceeding K of one per cent, 26. 

 Deficiencies between 34 and Yi of one per cent, 10. 

 Deficiencies between Yi and % of one per cent, 12. 

 Deficiencies more than ^ of one per cent, 14. 



Of the total number of guarantees of each element made, 7 per cent of the 

 nitrogen, 8 per cent of the available phosphoric acid, and 6 per cent of the potash 

 were not met. Ten of the 20 nitrogen deficiencies, 5 of the 22 available phosphoric 

 acid deficiencies, and 9 of the 17 potash deficiencies did not exceed one fourth of 

 one per cent. 



Compared with the 1934 inspection, there were 2 less shortages in nitrogen, 

 the same number in available phosphoric acid, and 20 less in potash. 



In the case of those fertihzers which did not conform strictly to the guarantee, 

 the discrepancies were of such a character as to make it evident that there was 

 no intentional attempt at violation of the regulations. 



