The effect of pig slurry on exchangeable potassium in calcareous soils |
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| Authors: | M Pilar Bernal Antonio Lax Asunción Roig |
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| Institution: | (1) Department of Organic Resources, Centro de Edafología y Biología Aplicada del Segura, CSIC, P.O. Box 4195, 30080 Murcia, Spain |
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| Abstract: | Pig slurry in quantities of 200, 400, 500, 600, 800, and 1000 m3 ha-1 year-1 was added to two calcareous soils, which differed in concentration and type of clay minerals. The soils were cultivated with two successive crops of pepper and tomatoes grown in containers. A control was given no slurry. The soils were analysed after harvesting for exchangeable K+. Differences in exchangeable K+ were studied in relation to the concentration and type of clay minerals. The soil with the higher clay content and of the illite type retained K in the exchangeable form to a much greater extent than the soil with the low clay content. In the soil with the lower clay content, of the interstratified illitic — montmorillonite type, very little K was incorporated into the exchange complex. The exchange capacity being low, the amount of K added had little effect on the level of exchangeable K+. |
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| Keywords: | Calcareous soils Cation exchange complex Exchangeable potassium Pig slurry Interstratified illitic Montmorillonite clay |
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