Sustainability of agricultural systems in transition : proceedings. Volume 64 - Payne, William A.,; Keeney, Dennis R.,; Rao, Srinivas C.,; American Society of Agronomy; Crop Science Society of America; Soil Science Society of America; World Bank; International Federation of Agricultural Producers (American Society of Agronomy ; Crop Science Society of America ; Soil Science Society of America, 2001)