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Effect of Chelating Agents on the Availability to Plants of Carrier-Free ⁵⁹Fe and ⁶⁵Zn Added to Soils to Simulate Contamination From Fallout¹

ABSTRACT

Carrier-free ⁵⁹Fe and ⁶⁵Zn were added to Dinuba fine sandy loam (neutral), Hacienda loam (calcareous), and Yolo loam (slightly acid), and equilibrated through drying and wetting cycles. Bush bean (Phaseolus vulgaris L., var. ‘Improved Tendergreen’), corn (Zea mays L., var. ‘Golden Cross Bantam’), and soybean (Glycine max Merr., var. ‘PI-54619-5-1’ and ‘Hawkeye’) were grown in ⁵⁹Fe-containing soil and bush bean (P. vulgaris L.), corn (Z. mays L.) and cotton (Gossypium hirsutum L., var. ‘Acala 442’) were grown in ⁶⁵Zn-containing soil. One-half of those with ⁵⁹Fe received Na₂EDDHA equivalent to 4.4 kg of Fe/ha had there been a 1:1 metal chelate and one-half of those with ⁶⁵Zn received Na₂EDTA equivalent to 5.5 kg of Zn/ha had metal been added with the chelating agent. The chelating agents had many different effects depending on soil and on crop. Chelating agents increased the specific activity of ⁵⁹Fe in the bush bean and soybeans. The specific activity of ⁵⁹Fe in corn was unchanged by chelating agent but was much higher than in bush bean and soybean with or without chelating agents. When carrier Fe was added, the behavior of ⁵⁹Fe was essentially unchanged. The specific activity of ⁶⁵Zn in plants in most cases was increased by the EDTA. The EDTA increased both ⁶⁵Zn and total Zn in corn, but the specific activity generally was unchanged by the chelate.

¹ This study was supported in part by contract AT(11-1)-34 Proj. 51 between the US Atomic Energy Commission and the University of California, Los Angeles.

² Professor and Laboratory Technician, Department of Agricultural Sciences, University of California, Los Angeles.

Received for publication March 4, 1969. Accepted for publication July 11, 1969.