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Effect of Chelating Agents on the Availability of ⁵⁴Mn Following its Addition as Carrier-Free ⁵⁴Mn to Three Different Soils¹

ABSTRACT

Carrier-free ⁵⁴Mn was mixed into samples of three different soils and allowed to equilibrate for several days. The soils were Yolo loam (slightly acid), Hacienda loam (calcareous), and Dinuba fine sandy loam (neutral). Bush bean (Phaseolus vulgaris var. ‘Improved Tendergreen’) and corn (Zea mays var. ‘Golden Cross bantam’) were grown in the soils with the presence and absence of various chelating agents. Yields and ⁵⁴Mn and total Mn were determined in the leaves and specific activities were calculated. After cropping, the control soils were assayed first for water soluble, then exchangeable ⁵⁴Mn and Mn, and then easily reducible or 10^-3M EDDHA, EDTA, DTPA, and NTA soluble ⁵⁴Mn and Mn. The ⁵⁴Mn appeared to differentially label various forms of Mn in the soil. Bush bean leaves contained more ⁵⁴Mn and Mn per plant than did corn. The specific activities of the ⁵⁴Mn in bush bean leaves were more like those for the easily reducible Mn than for other Mn forms for the three different soils but the specific activities in the corn, in contrast, were more nearly like those in the exchangeable Mn in the soils. DTPA tended to increase the amounts of both ⁵⁴Mn and Mn in plants with the Yolo and Dinuba soils with concommitant decreasing specific activity of Mn. With corn DTPA apparently added easily reducible Mn to the pool of available Mn. EDTA tended to increase uptake of the soluble and exchangeable Mn by the plants. NTA and EDDHA had little effect.

¹ This study was supported in part by a contract from the US Atomic Energy Commission AT(11-1)-34, Proj. 51.

² Department of Agricultural Sciences, University of California, Los Angeles.

Received for publication January 23, 1968. Accepted for publication August 15, 1968.