Practical Farming a Plain book On Treatment of the Soil And Crop Production Es
Practical Farming a Plain book On Treatment of the Soil And Crop Production Es
W F Wilbur Fisk Massey
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; phosphorus in phos- phate of Hme found in rocks and bones; and potassium in the potash salts and ashes in the form of potash. The object of commercial fertihzers is to furnish these things in a concentrated and readily available form. They are naturally associated with other matters, so that in a ton of fertilizer we find only certain percentages of the essen- tial plant foods. Then, in order to make a particularly low-priced article, the manufacturers often add what they call a "filler'' of ...perfectly inert material, so that while an apparently low price is charged, the farmer is really paying full price for all that is of value in the article, and is pay- ing freight on the filler, which is of no value. Hence, in buying fertihzers it is always cheaper to buy a high- grade article than a low-grade. I know of one instance where a manufacturer of a low-grade fertihzer added to each ton 500 pounds of the burnt oxide of iron which was the result of his manufacture of sulphuric acid that was used in the dissolving of the phosphatic rock.
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