Direct seeding of rice and weed management in the irrigated rice wheat cropping system of the Indo-Gangetic plains Edited: Y. Singh ...[et al.] text Los Banos IRRI 2008 Ind Incld. Bibl. Incld. Bibl. RICE WHEAT WEED CONTROL IRRIGATED LAND CROPPING SYSTEMS URN:ISBN:ISBN 978-971-22-0236-0