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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Niebes, JF., Dufey, J.E., Jaillard, B. et al. Release of nonexchangeable potassium from different size fractions of two highly K-fertilized soils in the rhizosphere of rape (Brassica napus cv Drakkar). Plant Soil 155, 403–406 (1993). https://doi.org/10.1007/BF00025068
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DOI: https://doi.org/10.1007/BF00025068