
408 _ REporT OF THE CHEMIST OF THE 
The amount of bone and sulphuric acid necessary to make a phos- 
phate containing eight pounds of available phosphoric acid and 
two pounds of insoluble phosphoric acid would amount to about 
forty pounds. If the potash is present in the form of a sulphate, 
about eighteen and one-half pounds of pure sulphate would be 
required to be equivalent to ten pounds of potash. Tabulating 
the foregoing figures, we have the following : 
Pounds. 
Dried blood required to furnish three pounds of nitrogen..... 30 
Bone and sulphuric acid required to furnish phosphates con- 
taining eight pounds of available and two pounds of insolu- 
ble phosphoric ‘acid... uM aii... ... . olsun ving elaine 40 
Sulphate of potash (pure) equivalent to ten pounds of potash.. 184 
Moisture and dirt............ Piva e's ores, 4 0: opt fo Iranian 11} 
hoy EE. Aerie ee Ry | 4 | IRR so 100 


Taking a low grade fertilizer, we find by analysis that it con- 
tains 0.8 per cent. of nitrogen, eight per cent. of available phos- 
phoric acid, 0.5 per cent. insoluble phosphoric acid and two per 
cent. of potash. Supposing the sources to be the same as in the 
previous case, we should have 

Pounds 
Dried blood required to furnish 0.8 pounds of nitrogen....... 8 
Bones, etc., required to furnish eight pounds of available and 
0.5 pounds insoluble phosphoric acid ..................4-- 37 
Sulphate of potash (pure) equivalent to two pounds of potash, 3.7 
Mormsture, Girt. eb6 os eisai eeu Sup tad oe er etl 51.3 
Total y's 9.0 wins ate low wien Abates ols lp dibs @ gal aise OGRE 5) 100 
While the foregoing calculations would not be entirely accurate 
for many fertilizers, they serve to give a fair idea of what a 
hundred pounds of a fertilizer may be made up, and why the 
chemist’s statement of analysis does not account for more than 
. twenty or thirty pounds in 100 pounds. 
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