Section 8
Chapter 7,047

Availability of potassium to crops at minimal exchangeable potassium level in soil by exhaustive cropping

Tarafdar, P.K.; Mukhopadhyay, A.K.

Tropical Agriculture 66(1): 87-90


ISSN/ISBN: 0041-3216
Accession: 007046983

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A plot culture experiment with exhaustive cropping of maize was conducted to determine the minimal level of exchangeable K and contribution of different K fractions to total uptake by the crop in 19 soils of West Bengal. The mean exchangeable K value decreased from 30-350 mg kg-1 to a constant minimal level of 15-85 mg kg-1/ The percentage ratio of the contribution of non-exchangeable sources to the total K uptake ranged 26.76-93.55, with an average of 62.9. Highest release of K from non-exchangeable sources occurred in the soil of quickest decrease of exchangeable K to its minimal level. Positive significant correlations between the percentage clay content and exchangeable K at minimal level and the K released from non-exchangeable sources were observed. Non-exchangeable K uptake was significantly correlated with total K removed by the crop and minimal exchangeable K level.

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