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Isotopically Exchangeable Cobalt: The Effect of Soil pH and Ionic Saturation of the Soil¹

ABSTRACT

Large increases in the uptake of Co, Zn, and Mn by sudangrass (Sorghum vulgare sudanense) were observed when FeCl₂, AlCl₃, and CaCl₂ were added to the soil in which the plants were grown. The isotopically exchangeable cobalt in the soil remained unchanged regardless of soil pH or the addition of Fe, Al, or Ca to the soil. Increases in the cobalt content of sudangrass result from changes in the soil solution concentration of cobalt in the soil rather than quantity of cobalt. The effect of Fe, Al, and Ca additions and soil pH in producing the changes in cobalt content of sudangrass was caused by soil factors rather than changes in plant response. One hundredth normal HCl was found to be a useful extracting agent for determining the quantity of cobalt in the soil and 0.1M CaCl₂ would give the best indication of the potential soil solution concentration (I) of cobalt in the soil.

¹ Contribution from the Missouri Agr. Exp. Sta., Missouri Journal Series no. 6046. Approved by the Director.

² Research Assistant and Professor respectively, Department of Agronomy, Univ. of Missouri, Columbia, Mo. 65201.

Received for publication August 24, 1970. Accepted for publication January 27, 1971.