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The Effect of Redox on the Solubility and Availability of Manganese in a Calcareous Soil¹

ABSTRACT

Soil suspensions were maintained at various fixed redox levels to assess the effect of redox on the solubility and availability of Mn. After 4 weeks of incubation, the liquid phase of the suspensions was analyzed, and the activity of Mn²⁺ was calculated. The results indicated that Mn solubility was controlled by MnCO₃ (rhodocrosite) below pe + pH = 16. Literature findings also suggest the presence of MnCO₃ when Mn²⁺ activities were calculated and plotted as a function of redox. When rice plants (Oryza sativa) were grown in the controlled redox suspensions, the uptake of Mn by rice plants was highly correlated with the activity of Mn²⁺ in solution. The study demonstrates the usefulness of chemical equilibrium relationships to predict the solubility of Mn in the soil and its availability to plants.

¹ Contribution from the Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523. Supported in part by the Tennessee Valley Authority through Cooperative Agreement no. 1131-101. Published as Scientific Series no. 2725.

² Graduate Research Assistant and Professor, respectively. The Senior Author is now Research Scientist, Battelle Pacific Northwest Laboratory, Richland, WA 99352.

Received for publication March 2, 1982. Accepted for publication November 10, 1982.

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