COBALT INVESTIGATIONS ON SOME NOVA SCOTIA SOILS

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Abstract
Greenhouse and laboratory studies were conducted on 14 Nova Scotia soils. Their Co content ranged from 3.6 to 21.0 ppm. Uptake of Co by oats was significantly related to soil pH and texture. No correlation was found between the Co content of the soils and that of the oat and timothy crops grown on them. Dolomite reduced the absorption of native soil Co by oats and markedly reduced absorption by both crops where Co was applied. Varied rates of N, P and K applied to aWoodville sandy loam had no effect on the Co concn. in the timothy but gypsum markedly increased Co concn. Cu increased the Co concn. of timothy where dolomite was not applied. Increasing the pH of the soil from 5.2 to 6.1 reduced the uptake of Co by timothy, but a further increase to pH 7.0 had no significant effect on Co concn. in the plants.

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