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Singh, R P and Desai , G M (1991) Farmer's fertilizer practices in the semi-arid tropics of India. Monograph. International Crops Research Institute for the Semi-Arid Tropics , Patancheru, Andhra Pradesh,India.
Singh, R P and Desai, G M (1991) Farmers fertilizer practices in the semi-arid tropics of india. Monograph. ICRISAT, Patancheru.