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lCRISAT, - (1989) Soil, Crop, and Water Management Systems for Rainfed Agriculture in the Sudano-Sahelian Zone: proceedings of an International Workshop,11-16 Jan 1987, ICRISAT Sahelian Center. Niamey, Niger. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India.