REPOET OF ANALYSES OF COMMERCIAL FER- 

 TILIZERS FOR THE SPRING AND 

 FALL OF 1900.* 



L. L. VanSlyke and W. H. Andrews. 



SUMMARY. 



(1) Samples collected. During the year 1900 the Station col- 

 lected 638 samples of commercial fertilizers, representing 450 

 different brands. Of these different brands 326 were complete 

 fertilizers; of the others, 48 contained phosphoric acid and potash 

 without nitrogen; 20 contained nitrogen and phosphoric acid 

 without potash; 10 contained nitrogen only; 37 contained phos- 

 phoric acid alone, and 9 contained potash salts only. 



(2) Nitrogen. The 326 brands of complete fertilizers contained 

 nitrogen varying in amount from 0.44 to 8.15 per ct., and aver- 

 aging 2.16 per ct. The average amount of nitrogen found by the 

 Station analysis exceeded the average guaranteed amo'unt by 0.10 

 per ct., the guaranteed average being 2.06 per ct., and the average 

 found being 2.16 per ct. 



In 235 brands of complete fertilizers the amount of nitrogen 

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

 varying from 0.01 to 2.02 per ct., and averaging 0.22 per ct. 



In 91 brands the nitrogen was below the guaranteed amount, 

 the deficiency varying from 0.01 to 1.98 per ct., and averaging 

 0.21 per ct. In 83 cases, the deficiency was less than 0.5 per ct. 



The amionnt of watersoluble nitrogen varied from (to 7.10 

 per ct. and averaged 0.89 per ct. 



♦Partial reprint of Bulletin No. 177. 



