A - Papers appearing in refereed journals
Goulding, K. W. T. 1984. The availability of potassium in soils to crops as measured by its release to a calcium-saturated cation-exchange resin. The Journal of Agricultural Science. 103 (2), pp. 265-275. https://doi.org/10.1017/s0021859600047213
Authors | Goulding, K. W. T. |
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Abstract | The amounts and rates of release of the different categories of soil K were measured on 21 soils from field experiments in England, Wales and West Germany using a calcium saturated cation exchange resin. The soils contained various amounts of exchangeable, fixed and matrix K; some contained no fixed K at all. These amounts could be qualitatively related to the clay contents of the soils. Regression analyses of K removed at harvest by spring barley, winter wheat, field beans and sugar beet, grown in the field experiments, were made on the quantities measured by the Ca-resin method and on K exchangeable to M ammonium acetate (EK). The Ca-resin method proved a better predictor of K availability than EK for all four crops. A multiple regression of the amount and rate of release of exchangeable K, and the rate of release of fixed K, as measured by Ca-resin, gave the best correlation with K removed. The contribution of fixed K to the regression increased with the demand of the crop for K and with the length of time the crops had been grown without K fertilizer. For the cereals, fixed K appeared to be either completely available or unavailable depending on whether its rate of release exceeded a critical value characteristic of each crop. The Ca-resin method is probably the best method available for measuring K reserves. It is, perhaps, too laborious for routine soil analysis, but could be used to characterize the long-term K release properties of a soil. RESP-09042 |
Year of Publication | 1984 |
Journal | The Journal of Agricultural Science |
Journal citation | 103 (2), pp. 265-275 |
Digital Object Identifier (DOI) | https://doi.org/10.1017/s0021859600047213 |
Open access | Published as non-open access |
Output status | Published |
Publication dates | |
01 Oct 1984 | |
Copyright license | Publisher copyright |
Publisher | Cambridge University Press (CUP) |
ISSN | 0021-8596 |
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