Effect of Chelating Agents on the Availability to Plants of Carrier-Free 59Fe and 65Zn Added to Soils to Simulate Contamination From Fallout1
- A. Wallace and
- R. T. Mueller2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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