Pee er ANALY SES. OF “COMMER: 
GhAks FER LILIZERSwb OR» THEcSPRING 
pe Coil OR” 1902." 

L. L. VAN SLYKE AND W. H. ANDREWs. 
SUMMARY. 
(1) Samples Collected. During the year 1902, the Station 
collected 924 samples of commercial fertilizers, representing 
446 different brands. Of these different brands 309 were com- 
plete fertilizers; of the others, 58 contained phosphoric acid 
and potash without nitrogen; 28 contained nitrogen and phos- 
phorie acid without potash; 7 contained nitrogen only; 34 con- 
tained phosphoric acid alone; and 10 contained potash salts 
only. 
(2) Nitrogen. The 309 brands of complete fertilizers contained 
nitrogen varying in amount from 0.68 to 8.97 per ct., and aver- 
aging 2.24 per ct. The average amount of nitrogen found by 
the Station analysis exceeded the average guaranteed amount 
by 0.82 per ct. the guaranteed average being 1.92 per ct. and 
the average found being 2.24 per ct. 
In 281 brands of complete fertilizers, the amount of nitrogen 
found was equal to or above the guaranteed amount, the excess 
varying from 0.01 to 1.39 per’ct., and averaging 0.37 per ct. 
In 28 brands the nitrogen was below the guaranteed amount, 
the deficiency varying from 0.01 to 1.51 per ct., and averaging 
0.19 per ct. In 26 cases the deficiency was less than 0.5 per ct. 
The amount of water-soluble nitrogen varied from 0 to 5.72 
per ct. and averaged 0.93 per ct. 
*Partial reprint of Bulletin No. 216. 
