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Published in Soil Sci Soc Am J 25:125-128 (1961)
© 1961 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Cobalt Uptake by Plants from Cobalt Impregnated Soil Minerals1

Alina Kabata2 and Kenneth C. Beeson3

ABSTRACT

A water-soluble Co salt applied to soils will result in a greatly increased uptake by crop plants for a short period. Although most of this Co is retained in the soil it gradually becomes unavailable and its effect may entirely disappear within 10 years. Since soil minerals are important factors in the Co supply to the soil solution the relative uptake of Co from substrates containing Co-impregnated bentonite, kaolin, hematite and muscovite treated in a manner to exclude exchangeable Co was investigated.

The highest sorption of Co was found in muscovite, but the highest percentage of sorbed Co soluble in 0.1N HCl was found in the bentonite. Ladino clover and orchardgrass absorbed several-fold more Co from bentonite than from the other minerals, and there was a correlation between this uptake of Co and the 0.1N HCl-soluble Co in the bentonite-sand culture at the conclusion of the experiment. In all cases the total uptake of Co was only a small fraction of the total supply of Co in the substrate.

NOTES

1 Contribution from the U. S. Plant, Soil and Nutrition Laboratory, Agricultural Research Service, USDA, Ithaca, N. Y.

2 Fellow, Rockefeller Foundation, 1958–1959, and Visiting Fellow, Cornell University. On leave from Institute of Cultivation, Fertilization and Soil Science, Pulawy, Poland.

3 Chemist.

Received for publication June 15, 1960. Accepted for publication August 10, 1960.






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