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Lime Induced Magnesium Stress in Corn: Impact of Magnesium and Phosphorus Availability¹

ABSTRACT

Previous research has indicated that lime additions to soils with variable surface charge resulted in reductions in measures of "exchangeable" Mg. The potential loss of Mg from "plant available" soil phases was evaluated in two greenhouse trials. These experiments were conducted in 1979 and 1980 to evaluate the potential for Mg nutritional problems in corn [Zea mays (L.) Merr.] grown on a Bradson clay loam (Typic Hapludults) over a wide range in soil pH and plant available P and Mg. Bulk soil samples were taken from each of three lime rate treatments in a field trial last amended with dolomite in 1967. In the first experiment three levels of lime and P were imposed in a complete factorial combination on each bulk sample. In the second experiment, the bulk soil sample with the lowest native level of extractable Mg was amended with eight rates of lime and two rates of Mg in a complete factorial combination. Increased Mg availability was associated with increased tissue Mg concentrations and shoot dry matter productivity. Added lime generally decreased extractable soil Mg, tissue Mg, and shoot dry matter. Applied P reduced "overliming" stress in the first experiment. Magnesium, P, and Zn were implicated in the nutritional stress associated with lime induced yield depressions.

¹ Contribution from the Agronomy Dep., College Stn., Univ. of Georgia, Athens, GA 30602. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree: Presented in part before Div. S-4., Soil Sci. Soc. Am., Nov.–Dec., 1980, Detroit, MI.

² Former Graduate Research Assistant and Professor, Agronomy Dep., Univ. of Georgia, Athens, GA 30602, respectively. Senior author is currently Assistant Professor, Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546.

Received for publication February 22, 1985. Accepted for publication May 16, 1985.