International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, 502 324
* Special lecture delivered at the Golden Jubilee celebration of the Indian Society of Soil Science at New Delhi on 8th December, 1984. This lecture is based on the joint study by Dr. J.S. Kanwar and Dr. Mohinder S. Mudahar at the International Fertilizer Development Center, Muscle Shoals, Post Box 2040, Alabama 35660, USA
