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Soil Manganese: E Values, Distribution of Manganese-54 among Soil Fractions, and Effects of Drying¹

ABSTRACT

The Mn labile pool was determined in a wide range of United Kingdom soils, using ⁵⁴Mn tracer and two different extractants, CaCl₂ and DTPA. Good agreement was obtained between E values obtained by two different equilibration procedures in CaCl₂, but for most soils the concentrations of CaCl₂-extractable Mn were considerably lower than the E-values. Higher E-values were obtained in DTPA than in CaCl₂, indicating that the former dissolved some nonisotopically exchangeable Mn. The rate of disappearance of ⁵⁴Mn from the soil solution, and its distribution in various fractions, differed greatly between the soils. Generally, the radioisotope labeled all the soil fractions determined, with the majority of ⁵⁴Mn associated with the water-soluble + exchangeable, organically bound and easily reducible oxide fractions. When the labeled soils were subjected to air and oven-drying, net gains of ⁵⁴Mn were observed in the water-soluble + exchangeable, resistant and residual Mn fractions, with corresponding reductions in the easily reducible oxide fractions. Upon drying, native Mn increased in the water-soluble + exchangeable and EDTA-extractable fractions. Possible mechanisms for these changes are discussed.

¹ Contribution from The Edinburgh School of Agriculture, West Mains Road, Edinburgh, EH9 3JG, Scotland, UK.

² Former Postgraduate Student, and Head of Soil Science Dept., respectively. Present address of senior author is Agency of Environmental Conservation, Heritage 2 Office Bldg., 79 River Street, Montpelier, VT 05602.

Received for publication September 8, 1983. Accepted for publication November 2, 1983.