RELEASE OF MAGNESIUM FROM SOIL CLAY AND SILT FRACTIONS DURING CROPPING1

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Abstract
The availability of Mg from different fractions of four Michigan soils and from one fraction each of chlorite and bentonite was determined by cropping in the greenhouse. Enough of each fraction to supply a total of 20 mg of Mg per culture was mixed with quartz sand and cropped twice with oats.The Mg concentration of the soil fractions increased as the particle size decreased, except that the concentration of the fine clay fraction tended to be less than the medium clay fraction. Magnesium concentration of fractions from the Sims soil tended to be greater than the other soil fractions.The data indicate that Mg is available for plant growth from the octahedral layer as well as from interlayer material. X-ray data suggest that sufficient interlayer material was removed from some clay fractions to convert heat-stable 14-A material to heatcollapsible 14-A material. The availability of Mg from different fractions of four Michigan soils and from one fraction each of chlorite and bentonite was determined by cropping in the greenhouse. Enough of each fraction to supply a total of 20 mg of Mg per culture was mixed with quartz sand and cropped twice with oats. The Mg concentration of the soil fractions increased as the particle size decreased, except that the concentration of the fine clay fraction tended to be less than the medium clay fraction. Magnesium concentration of fractions from the Sims soil tended to be greater than the other soil fractions. The data indicate that Mg is available for plant growth from the octahedral layer as well as from interlayer material. X-ray data suggest that sufficient interlayer material was removed from some clay fractions to convert heat-stable 14-A material to heatcollapsible 14-A material. © Williams & Wilkins 1973. All Rights Reserved.

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