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Chelating Agent and Plant Nutrient Interactions Affecting the Iron Nutrition of Soybeans¹

ABSTRACT

Studies were made to evaluate the effect of absorbed chelating agent on the subsequent absorption-translocation of iron in soybeans. Iron was separated from the chelating agent by using split-medium and split-root techniques.

Chelating agents did have some effect on the absorption of radioiron from Millville soil and the translocation of foliar-applied radioiron. These effects were not great enough to correct iron chlorosis. Phosphorus in the nutrient medium or within the plant depressed the uptake and translocation of iron by the plant. This effect of phosphorus on iron could not be offset by use of chelating agents. The primary role of iron chelates in plant nutrition appears to be that of making iron soluble and available to the root for absorption.

¹ Contribution from the Mineral Nutrition Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md.

² Plant Physiologist, Soil Scientist, and Chemist, respectively.

Received for publication September 28, 1959. Accepted for publication November 3, 1959.