New York Agricultural Experiment Station. 137 



average amount of available phosphoric acid found by the Sta- 

 tion analysis exceeded the average guaranteed amount by 0.70 

 per cent, the guaranteed average being 8.52 per cent and the 

 average found being 9.22 per cent. 



In 136 brands of complete fertilizers, the amount of available 

 phosphoric acid found was above the amount guaranteed, the 

 excess varying from 0.02 to 3.85 per cent and averaging 1.01 

 per cent. 



In 3G brands, the available phosphoric acid was below the 

 guaranteed amount, the deficiency varying from 0.01 to 1.86 per 

 cent and averaging 0.40 per cent. In 26 cases the deficiency was 

 below 0.5 per cent. 



The amount of water-soluble phosphoric acid varied from 0.65 

 to 9.08 per cent and averaged 5.75 per cent. 



(4) Potash. The complete fertilizers contained potash varying 

 in amount from 0.58 to 16.52 per cent and averaging 3.92 per 

 cent. The average amount of potash found by the Station an- 

 alysis exceeded the average guaranteed amount by 0.18 per cent, 

 the guaranteed average being 3.74 per cent and the average 

 found being 3.02 per cent. 



In 118 brands of complete fertilizers, the amount of potash 

 found was above the guaranteed amount, the excess varying from 

 0.01 to 3.59 per cent and averaging 0.46 per cent. 



In 51 brands, the potash was below the guaranteed amount, 

 the deficiency varying from 0.01 to 1.74 per cent and averaging 

 0.46 per cent. In 33 of these cases, the deficiency was less than 

 0.5 per cent. 



In 18 cases among the 172 brands of complete fertilizers the 

 potash was contained in the form of sulphate free from an excess 

 of chlorides. 



(5) The retail selling price of the complete fertilizers varied 

 from |15 to $40 a ton and averaged |25.25. The retail cost of 

 the separate ingredients unmixed varied from |11.26 to $29.28 

 and averaged $18.92, or $6.33 less than the selling price. 



