REPORT OF ANALYSES OF COMMERCIAL FER- 
TILIZERS FOR THE SPRING AND 
FALL OF 1900.* 
L. L. VANSLYKP AND W. H. ANDREWS. 

SUMMARY. 
(1) Samples collected. During the year 1900 the Station col- 
lected 688 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 phosphorie 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 amount 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 838 cases, the deficiency was less than 0.5 per ct. 
The amount of water-soluble nitrogen varied from 0 to 7.10 
per ct. and averaged 0.89 per ct. 

* Partial reprint of Bulletin No. 177. 
