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. pp. 111-129. In: Sustainable Agriculture: Green Manure in Rice Farming. IRRI, Los Banos, Phillippines.

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. 297 Prasad, R., Power, J. F. 1997: Soil Fertility Management for Sustainable Agriculture. CRC-Lewis, Boca Raton, USA. Soil Fertility Management for

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. pp. 55-64. In: Micronutrient Research and Sustainable Agricultural Productivity in India. Int. Lead-Zinc Research Organisation Inc. and Indian Lead-Zinc Information Centre, New Delhi. Micronutrient Research

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. E., Sy, A. A., Alegbejo, M. D. 1998: Rice yellow mottle virus (RYMV) in Africa: Evolution, distribution, and economic significance of sustainable rice production and management strategies. Journal of Sustainable Agriculture , 11 , 85

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application. In: Use of Phosphate Rocks for Sustainable Agriculture. (Eds.: Zapata, F. & Roy, R. N.) FAO Fertilizer and Plant Nutrition Bulletin No 13. FAO. Rome. http://www.fao.org/docrep/007/y5053e/y5053e0b.htm#TopOfPage Csathó

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Takkar, P. N. (1996): Micronutrient research and sustainable agricultural productivity in India. Journal of Indian Society of Soil Science , 44 , 562-581. Micronutrient research and sustainable agricultural productivity in

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34 777 781 Ely D.G.: 1994. The role of grazing sheep in sustainable agriculture. Sheep Research Journal, Special Issue. 37–51 pp

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sustainable agricultural production systems? Bodenkultur , 60 , 43–60. Feller C. Concepts and practices of nutrient management in agro-ecosystems: Can we draw lessons from history

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50 Prasad, R., Power, J. F. 1997: Soil Fertility Management for Sustainable Agriculture. CRC Press, Boca Raton, U.S.A. 356 pp. Soil Fertility

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, É., Szabados, I. & Marth, P., 1996. Cadmium content of plants as affected by soil cadmium concentration. In: Soil and Plant Analysis in Sustainable Agriculture and Environment. (Eds.: Hood, T. M. & Jones, J. B.). 827--839. Marcel Dekker Inc. New York

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