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Effect of the Zinc Chelate of Ethylenediaminetetraacetic Acid on Plant Uptake of Zinc and Other Heavy Metals¹

ABSTRACT

In a study of the effect of chelated zinc on plant composition, the addition of the zinc chelate of ethylenediaminetetraacetic acid (EDTA) to the soil at planting time gave results varying with the clay content of the soil. Both zinc and copper increased in the plants grown on a sandy soil. Manganese and iron contents were unaffected. No increase in zinc or copper contents of the plants occurred on a heavy silt loam soil, although as high as 50 ppm. of zinc was added. The added zinc disappeared from the water soluble and exchangeable forms in the latter but some buildup of exchangeable zinc occurred in the sandy soil. A large proportion of the added zinc was recovered by acid extraction. Laboratory studies indicated that the heavy soil rapidly takes the zinc away from the EDTA.

¹ Presented before Div. II Soil Science Society of America, Davis, Calif. Aug. 16, 1955.

² Former Assistant in Agronomy, University of Illinois, and Professor of Soil Fertility, University of Illinois, respectively. This work was submitted by the senior author as part of a thesis in partial fulfillment of the requirements for the M.S. degree in the Graduate College.

Received for publication August 8, 1955.