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Updated: July 4, 2025
Even in soils abundantly supplied with potassium temporary use may well be made of soluble potassium salts when no adequate supply of decaying organic matter can be provided. For this purpose, kainit which contains potassium and also magnesium and sodium in chlorides and sulfates is preferred to the more concentrated and more expensive potassium salts.
Thus the combined gross earning power of both land and labor is less than $600 a year; while the brain work applied to the improvement of the soil on the same farm brings a net return of more than $950. Once in three years 50 pounds an acre of kainit was also applied. This would contain only 5 pounds of potassium, or less than would be required for one 7-bushel crop of corn.
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