Traces of 2:1 layer-silicate clays in Oxisols from Brazil, and their significance for potassium nutrition

A - Papers appearing in refereed journals

Arkcoll, D. B., Goulding, K. W. T. and Hughes, J. C. 1985. Traces of 2:1 layer-silicate clays in Oxisols from Brazil, and their significance for potassium nutrition. Journal of Soil Science. 36 (1), pp. 123-128.

AuthorsArkcoll, D. B., Goulding, K. W. T. and Hughes, J. C.
Abstract

SUMMARY The recuperation of the soil during bush fallows after a period of cultivation is an important part of the success of shifting cultivation in the lowland humid tropics. However, the sources of the nutrients which enable the observed rapid growth on apparently exhausted soils has never been satisfactorily explained. Some soils from the Manaus region of Brazil have been examined in an attempt to identify reserves of potassium. X-ray diffraction, physical and chemical analyses, and microcalorimetric measurements of K-Ca exchange show that small reserves of K occur in 2:1 clay minerals which exist in trace amounts in the soils. The results suggest that the clay fraction of the soil may play a more important role in nutrient supply than previously realized. The reserves are considered in terms of the land use of the area.

Year of Publication1985
JournalJournal of Soil Science
Journal citation36 (1), pp. 123-128
Digital Object Identifier (DOI)doi:10.1111/j.1365-2389.1985.tb00317.x
Open accessPublished as non-open access
Publication dates
Print01 Mar 1985
Copyright licensePublisher copyright
PublisherWiley
ISSN0022-4588

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