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Effect of Differential Adsorption of Potassium and Magnesium in Soils on Magnesium Uptake by Corn¹

ABSTRACT

Indices of the differential adsorption of potassium (K) and magnesium (Mg) were used to explain the differences in magnesium uptake by corn seedlings (Zea mays L.) grown on two widely different soils of the Rayne (a fine-loamy, mixed, mesic Typic Hapludult) and the Hublersburg (a clayey, kaolinic, mesic Typic Hapludult) series. The differential adsorption of potassium was found to be the controlling factor in the uptake of magnesium by corn seedlings in these two soils. The differential adsorption concept may be useful in predicting which soils may or may not respond readily to magnesium fertilization.

¹ Contribution from the Pennsylvania Agric. Exp. Stn., University Park, PA 16802. Authorized for publication on 19 Dec. 1980 as Paper no. 6159 in the Journal Series.

² Research Soil Scientist, U.S. Regional Pasture Research Lab., University Park, Pa., and Professor of Soil Chemistry, Penn. State Univ., respectively.

Received for publication January 19, 1981. Accepted for publication May 11, 1981.