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Magnesium Availability as Affected by Deficient and Adequate Levels of Potassium and Lime¹

ABSTRACT

The availability of soil Mg was measured on 7 major soil types of Alabama by growing Sudangrass and ladino clover in the greenhouse. The plants were grown at deficient and adequate levels of available K and lime. Plant growth and plant content of Ca, Mg, and K were measured. Total up-take of Mg was used as a measure of its availability. Growth response to Mg by the two crops occurred on the same soils. Soils that had < 4% of the cation-exchange capacity as Mg were Mg-deficient. Mg-deficient plants contained 0.25 me. or less of Mg per g. of dry material. On Mg-deficient soils, the availability of Mg to both crops tended to be greater at the higher K level. However, the availability of Mg on the same soils was less at the higher soil pH. Mg availability on soils not deficient in Mg in general was affected in the reverse.

¹ Contribution from the Department of Agronomy and Soils, Agr. Exp. Sta., Auburn University, Auburn, Ala. Financial assistance was given by International Minerals and Chemical Corp.

² Associate Soil Chemist and former Research Assistant in Agronomy, respectively.

Received for publication February 25, 1961. Accepted for publication May 22, 1961.