New York Agricultural Experiment Station. 439 



(3) Available pliosplioric acid. The 326 brands of complete 

 fertilizers contained available phosphoric acid vai'ying in amount 

 from 1.20 to 17.47 per ct. and averaging 8.90 per ct. The aver- 

 age amount of available phosphoric acid found by the Station 

 analysis exceeded the average guaranteed amount by 1.28 per 

 ct., the guaranteed average being 7.G2 per ct. and the average 

 found being 8.90 per ct. 



In 301 brands of comi>lete fertilizers the amount of available 

 phosphoric acid found was equal to or above the amount guar- 

 anteed, the excess varying from 0.02 to 10.80 per ct. and aver- 

 aging 1.46 per ct. 



In 25 brands the available phosphoric acid was below the 

 guaranteed amount, the deficiency varying from 0.02 to 5.32 per 

 ct. and avea'aging 1.03 per ct. In 14 cases the deficiency was 

 beilow 0.5 per ct. 



The amount of water-soluble phosphoric acid varied from 

 to 9.95 per ct. and averaged 5.52 per ct. 



(4) Potash. The complete fertilizers contained potash varying 

 in amount from 0.27 to 12.00 per ct., and averaging 4.84 per ct. 

 The average amount of potash found by the Station analysis ex- 

 ceeded the average guaranteed amount by 0.41 per ct., the guar- 

 anteed average being 4.43 per bent., and the average found being 

 4.84 per ct. 



In 250 brands of complete fertilizers, the amount of potash 

 found was equal to or above the guaranteed amount, the excess 

 varying from 0.01 to 6.49 per ct. and averaging 0.65 per ct. 



In 76 brands, 'the potash was below the guaranteed amount, 

 the deficiency varying from 0.01 to 2.21 per ct. and averaging 

 0.43 per ct. In 56 of these cases, the deficiency was less than 

 0.5 per ct. 



In 64 cases among the 326 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 |60 a ton and averaged |27.27. The retail cost of 

 the separate ingredients unmixed averaged |19.72, or |7.55 less 

 than the selling price. 



