Abstract
BRITISH soils containing similar amounts of total potassium can vary greatly in their ability to release non-exchangeable potassium, but the reasons for this are not well understood. The non-exchangeable potassium reserves in many soils become available to plants as the exchangeable and water-soluble potassium is removed. Some soils can provide amounts of potassium adequate for crop growth during many years, but the release from reserves in others is too slow to meet crop requirements. The nature of the potassium-containing minerals and their amount and distribution of particle size are undoubtedly important ; the past cropping history and the nature and amount of potassium fertilizer residues also influence the release of potassium from soils.
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References
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Rouse, R. D., and Bertramson, B. R., Proc. Soil Sci. Soc. Amer., 14, 113 (1950).
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ARNOLD, P. Potassium-supplying Power of Some British Soils. Nature 187, 436–437 (1960). https://doi.org/10.1038/187436a0
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DOI: https://doi.org/10.1038/187436a0
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