Potassium exchange behaviour in Carribean volcanic ash soils under banana cultivation |
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Authors: | S Fontaine B Delvaux J E Dufey A J Herbillon |
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Institution: | (1) University of Louvain, Place Croix du Sud 2, B-1348 Louvain-la-Neuve, Belgium |
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Abstract: | Ca−K exchange isotherms of samples from carribean (Martinique island) volcanic soils differing in the weathering stage and
in the nature of cation-exchange material were studied. Allophanic soils high in organic matter (Troporthents, Hydrandepts)
exhibit a low selectivity for K-ions. Potassium is adsorbed specifically in the halloysitic soils (Humitropepts). A positive
relationship exists between the affinity for K+ and the halloysite content. This relation is most likely due to the close association of 1∶1 hydrated phyllosilicates with
2∶1 smectitic clay minerals. A lower selectivity for K was observed in the kaolinitic soil materials (Dystropepts). Because
parent rocks are very low in K, these exchange properties strongly influence their K status, through differences in susceptibility
to K leaching losses and K availability to banana plants in intensive cropping systems. |
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Keywords: | allophane banana crop fertilization halloysite ion exchange potassium volcanic ash soils |
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