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Long-term effects of potassium fertilization on yields and fertility status of calcareous soils of south-west France

Abstract : A long-term field experiment was conducted near Toulouse (south-west France) to verify to what extent increasing fertilizer dressings would increase yields on calcareous soils in a cereals-oilseeds-legumes rotation. Over a 2%year period, withholding K significantly depressed yield once; K inputs affected the total amount of K absorbed at flowering, without subsequent effects on yields. Exchangeable K content on non-fertilized plots declined slightly over the experimental period, but without reaching levels expected from nutrient balance estimates. Annual applications of K equal to average offtake in grain were adequate to maintain available soil K content at its initial value. Potassium release kinetics for the exchangeable fraction, evaluated from Ca-resin extraction, clearly discriminated between fertilized and non-fertilized treatments. Both soils exhibited similar patterns for diffusion-controlled K release. These results highlight the role of K reserves readily available in illite-rich calcareous soils and demonstrate the importance of cultural residues in K fertility management.
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  • HAL Id : hal-02694012, version 1
  • PRODINRA : 131174
  • WOS : A1996VZ66700013

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Claire Jouany, Bruno Colomb, Melanie Bosc. Long-term effects of potassium fertilization on yields and fertility status of calcareous soils of south-west France. European Journal of Agronomy, Elsevier, 1996, pp.287-294. ⟨hal-02694012⟩

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