New Yoek Agricultural Experiment Station. 277 



from 4.77 to 13.45 per cent and averaging 9.27 per cent. The 

 average amount of available phosphoric acid found by the Station 

 analysis exceeded the average guaranteed amount by 0.96 per cent, 

 the guaranteed average being 8.31 per cent and the average found 

 being 9.27 per cent. 



In 93 brands of complete fertilizers, the amount of available 

 phosphoric acid found was above the amount guaranteed, the ex- 

 cess varying from 0.09 to 4.62 per cent and averaging 1.24 per 

 cent. 



In 18 brands, the available phosphoric acid was below the guar- 

 anteed amount, the deficiency varying from 0.03 to 1.61 per cent 

 and averaging 0.48 per cent. In 11 cases the deficiency was below 

 0.5 per cent. 



The amount of water-soluble phosphoric acid varied from 0.62 

 per cent to 9.78 per cent, and averaged 5.72 per cent. 



(4) Potash. The complete fertilizers contained potash varying 

 in amount from 0.36 to 10.43 per cent and averaging 4.36 per 

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

 sis exceeded the average guaranteed amount by 0.26 per cent, 

 the guaranteed average being 4.10 per cent and the average found 

 being 4.36 per cent. 



In 79 brands of complete fertilizers, the amount of potash 

 found was above the guaranteed amount, the excess varying from 

 0.01 to 2.87 per cent and averaging 0.57 per cent. 



In 31 brands, the potash was below the guaranteed amount, the 

 deficiency varying from 0.05 to 2.29 per cent and averaging 0.54 

 per cent. In 18 of these cases, the deficiency was less than 0.5 

 per cent. 



In 11 cases among the 111 brands of complete fertilizers the 

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

 of chlorides. 



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

 from $14.25 to $35 a ton and averaged $23.16. The retail cost of 

 the separate ingredients unmixed averaged $17.34, or $5.82 less 

 than the selling price. 



