REPORT OF ANALYSES OF COMMERCIAL FERTIL- 
IZERS FOR THE SPRING OF 1904.* 
W. H. Jorpan, L. L. Van Stryke anp W. H. ANDREWS. 
SUMMARY. 
(1) Samples Collected. During the spring of 1904, the Sta- 
tion collected 468 samples of commercial fertilizers, representing 
371 different brands. Of these different brands 275 were com- 
plete fertilizers; of the others, 47 contained phosphoric acid and 
potash without nitrogen; 16 contained nitrogen and phosphoric 
acid without potash; 7 contained nitrogen only; 22 contained 
phosphoric acid alone; and 4 contained potash salts only. 
(2) Nitrogen. The 275 brands of complete fertilizers con- 
tained nitrogen varying in amount from 0.54 to 9.74 per ct., and 
averaging 2.12 per ct. The average amount of nitrogen found by 
the Station analysis exceeded the average guaranteed amount by 
0.11 per ct., the guaranteed average being 2.01 per ct., and the 
average found being 2.12 per ct. 
In 194 brands of complete fertilizers, the amount of nitrogen 
found was equal to or above the guaranteed amount, the excess 
varying from 0.01 to 1.78 per ct., and averaging 0.22 per ct. 
In 81 brands the nitrogen was below the guaranteed amount, 
the deficiency varying from 0.01 to 1.04 per ct., and averaging 
0.17 per ct. In 77 cases the deficiency was less than 0.5 per ct. 
The amount of water-soluble nitrogen varied from 0 to 9.62 
per ct. and averaged 1.01 per ct. 
(3) Available Phosphoric Acid. The 275 brands of complete 
fertilizers contained available phosphoric acid varying in amount 
from 1.26 to 11.38 per ct., and averaging 8.52 per ct. The average 
amount of available phosphoric acid found by the Station analysis 
exceeded the average guaranteed amount by 0.96 per ct., the 
guaranteed average being 7.56 per ct., and the average found 
being 8.52 per ct. 
*Partial reprint of Bulletin No. 253. 
