Abstract
Finely ground sanidine feldspar from the Huila area of Colombia (< 100 mesh, largely sanidine, 7% K) and KCl were used as fertilizers in a pasture experiment at Carimagua on an oxisol containing lmg total K and 23µg exchangeable K per g (0.6µeq per g). The association ofBrachiaria dyctioneura andPueraria phaseoloides clearly responded to K taken up from the KCl with a small though non-significant response to the feldspar. During 14 months the crop took up between 25 and 68% of the KCl-K or about 10% of the feldspar-K. Much of the applied KCl became non-exchangeable, but was released as required by the crop: the soil contained an Al chlorite-vermiculite which held the native K and fixed and released K during the experiment. The feldspar may be valuable as a slow release fertilizer in low input agricultural systems particularly on leached soils of low ECEC.
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References
Aitken AP (1887) Ground feldspar as a potash manure. Transactions of the Highland Society (Scotland) 19: 253–255
Arkcoll DB, Goulding KWT and Hughes JC (1985) Traces of 2:1 layer silicate clays in Oxisols from Brazil, and their significance for potassium nutrition. Journal of Soil Science 36: 123–128
Belentine W (1889) Experiments with feldspar as a source of potash. Maine Agricultural Experimental Station. Annual Report, 143-144.
Berner RA and Holdren GR (1979) Mechanism of feldspar weathering. II Observations of feldspars from soils. Geochimica et Cosmochimica Acta 43: 1173–1186
CIAT (Centro International de Agricultural Tropical) Annual Reports of the Tropical Pastures Programme 1981, 1982, 1983, 1984
Drever JI (1982) The Geochemistry of Natural Waters, Chapter 6 Prentice-Hall, Englewood Cliffs
Holdren GR and Berner RA (1979) Mechanism of feldspar weathering I Experimental Studies. Geochimica et Cosmochimica Acta 43: 1161–1171
Huang PM (1977) Feldspars, Olivines, Pyroxenes and Amphiboles. In Minerals in the Soil Environment (eds J. B. Dixon and S. B. Weed) pp 553–602 Soil Science Society of America, Madison Wisconsin
Kronberg BI (1976) The geochemistry of some Brazilian soils and geochemical considerations for agriculture on highly leached soils. Ph.D. thesis, University of Western Ontario, London, Ontario
Lindsay WL (1979) Chemical Equilibria in Soils, John Wiley, New York
Nortcliff SN and Thorne JB (1987) Temporal and spatial variations in nutrient fluxes in a forested tropical ecosystem. Proceedings of the Conference on Nutrient Cycling in Tropical Ecosystems Stirling September 1987
Salinas JG and Garcia R (1985) Methods quimicos para el analisis de suelos acidos y plantas forrajeras. Centro Internacional de Agricultura Tropical, Programa de Pastos Tropicales, Cali
Sanchez PA (1985) Fertilizers make continuous cropping possible in the Amazon. In Better Crops International, Potash and Phosphate Institute 1; 12–15
Sanchez PA and Salinas JS (1981) Low input technology for managing Oxisols and Ultisols in Tropical America. Advances in Agronomy 34: 279–406
Sanz Scovino JI (1986) Native sources of soil potassium and the use of feldspars as fertilizers in the savannah of Colombia. Ph.D. thesis, Reading University
Sparks DL (1986) Potassium release from interlayers. In Nutrient Balances and the need for Potassium. 13th Congress of the International Potash Institute, 83–95. International Potash Institute, Worblaufen-Bern
Sylvester-Bradley R and Mosquera D (1985) Nitrification and responses to Rhizobium inoculation in tropical savannah as affected by land preparation. In Nitrogen Management in Farming Systems in Humid and Subhumid Tropics (eds B. T Kang and J. van der Heide), Institute for Soil Fertility, Haren, The Netherlands
USDA (1975) Soil Taxonomy United States Department of Agriculture, Agriculture Handbook No. 436 United States Government Printing Office, Washington
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Sanz Scovino, J.I., Rowell, D.L. The use of feldspars as potassium fertilizers in the savannah of Colombia. Fertilizer Research 17, 71–83 (1988). https://doi.org/10.1007/BF01050458
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DOI: https://doi.org/10.1007/BF01050458