Quotation from: General Science

Written by: Bertha M. Clark


Phosphorus is obtained from bone ash and from phosphate rock which is
widely distributed over the surface of the earth. Bone ash and
thousands of tons of phosphate rock are treated with sulphuric acid to
form a phosphorus compound which is soluble in soil water and which,
when added to soil, will be usable by the plants growing there.


The other important ingredient of most fertilizers is potash. Wood
ashes are rich in potash and are a valuable addition to the soil. But
the amount of potash thus obtained is far too limited to supply the
needs of agriculture; and to-day the main sources of potash are the
vast deposits of potassium salts found in Prussia.

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