Sustainable management of potassium.

Author:

Askegaard M.,Eriksen J.,Johnston A. E.

Abstract

Abstract

Potassium (K) is one of the most abundant nutrient elements in soil and one that is required in large amounts by plants. Of the huge amount of K in many soils only a fraction is available for immediate uptake by plants. In the longer term, and in the absence of any added K, the vulnerability of crop production to K availability is mainly related to the amount and rate of release of K from soil minerals. Maximizing the efficient use of K in the soil-plant system requires, whether from soil minerals, organic manure or fertilizers, a knowledge of critical soil K thresholds to maintain soil fertility and crop production. In cropping systems with a reduced K input, soil fertility will be compromised if soil K values fall below the critical level for the soil type and farming system. Successful K management in low-K-input systems depends on whether the release of indigenous K, minimizing leaching losses on sandy soils and, if economically viable, the return of K from urban areas, can supply sufficient K to meet crop demand. The extent to which soil K can be exploited will depend on soil type and mineralogy, cropping system and time-scale. Thus different soil types and cropping systems require a site-specific approach to K management.

Publisher

CABI

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