INFLUENCE OF CALCIUM ON AVAILABILITY OF OTHER SOIL CATIONS

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Abstract
Conditions approach the optimum for the cation nutrition of alfalfa when 65% of the exchange complex of the soil is occupied by Ca, 10% by Mg, 5% by K, and 20% by H. Ca is dominant in the soil, K in the plant. When any cation is deficient in soil more of others move into plant, cation-equivalent content of plant tending to remain constant. Plants tend to absorb more K than required at expense of Ca and Mg. Many cases of Mg-deficient plants occur when large amounts of K are applied, especially on acid and sandy soils. Repeated liming until more than 65% exchange Ca throughout soil tends to produce deficiency Mn and other minor elements.

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