Release of nonexchangeable potassium from different size fractions of two highly K-fertilized soils in the rhizosphere of rape (Brassica napus cv Drakkar) |
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Authors: | Niebes Jean-Francois Dufey Joseph E Jaillard Benoit Hinsinger Philippe |
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Institution: | (1) UCL Sciences du Sol, Place Croix du Sud 2/10, B-1348 Louvain-la-Neuve, Belgium;(2) INRA-ENSA.M Science du Sol, 2 Place Viala, F-34060 Montpellier cedex 01, France |
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Abstract: | The release of nonexchangeable potassium by the different particle size fractions of two soils was studied with a culture device designed to confine soil samples in the rhizosphere of rape (Brassica napus cv Drakkar). After 8 days of cropping, the contribution of nonexchangeable K to K uptake ranged from 50% in the fine clay to 80–100% in the coarser fractions. Due to their high supplying power and their relative abundance, the silt fractions provided a major part of the supply of K by these soils. |
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Keywords: | Brassica napus K release nonexchangeable potassium particle size rhizosphere |
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