TY - BOOK AU - Humphreys, E. AU - Roth, C. H. ED - Permanent beds and rice-residue management for rice-wheat systems in the Indo- Gangetic Plain TI - Permanent beds and rice-residue management for rice-wheat systems in the Indo- Gangetic Plain: proceedings of a Workshop held in Ludhi ana, India, 7-9 September 2006 U1 - 338.01 22 PY - 2008/// CY - Canberra PB - Australian Centre for International Agricultural Resea rch KW - Factors of production N1 - Includes bibliographical references ER -