Potassium-releasing power of soils from the Agdell rotation experiment assessed by glasshouse cropping

A - Papers appearing in refereed journals

Arnold, P. W. and Close, B. M. 1961. Potassium-releasing power of soils from the Agdell rotation experiment assessed by glasshouse cropping. The Journal of Agricultural Science. 57 (3), pp. 381-386. https://doi.org/10.1017/S0021859600049364

AuthorsArnold, P. W. and Close, B. M.
Abstract

1. On cropping Agdell Experiment topsoils to exhaustion with perennial rye-grass in the glasshouse the total K uptakes were directly proportional to the initial exchangeable K contents of the soils.2. The ability of the Agdell topsoils to release non-exchangeable K under glasshouse conditions decreased in the order: PK-rotation with fallow < NPK rotation with fallow < PK-rotation with clover < NPK-rotation with clover < no-fertilizerrotation with fallow = no-fertilizer rotation with clover.3. Releases of non-exchangeable K were at least 2·5 times larger than the falls in the exchangeable K for all the Agdell soils.4. In a ‘take-down’ experiment in the glasshouse on a soil receiving K fertilizer each year in the Saxmundham Rotation I Experiment, loosely held non-exchangeable K was released at a near-linear rate. At least a part of the loosely held non-exchangeable K in the Agdell soils was also released at a near-linear rate.

Year of Publication1961
JournalThe Journal of Agricultural Science
Journal citation57 (3), pp. 381-386
Digital Object Identifier (DOI)https://doi.org/10.1017/S0021859600049364
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
PublisherCambridge University Press
Cambridge University Press (CUP)
ISSN0021-8596

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