The chelating agent diethylenetriaminepentaacetic acid (DTPA) which has the ability to increase uptake by plants of several metals and is widely used as a practical means of correcting iron deficiency in plants has been shown to greatly increase the uptake from soils of 241Am by plants. Application of high levels of zinc or manganese salts decreased 241Am content of plants only slightly, indicating little, if any, competing effect. Most accumulated 241Am was transported to leaves of all species studied. The ability of plants to accumulate 241Am was not related to root temperature. During a subsequent growth period after applications of 241Am to bush beans, some of the 241Am was transported from the old leaves to the new leaves and also to new roots. The chelating agent DTPA had no effect on the retranslocation, however. Extraction studies with soil indicated that DTPA, but not EDDHA, could quantitatively extract 241Am from soil.
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