na INLIS000000000001096 0010-0124000782 IMPROVING the productivity and sustainability of rice-wheat systems issues and impacts ed. by Jagdish K. Ladha [et al.] Madison, Winconsin, USA American Society of Agronomy 2003 xix, 231 p.: ills.; 23 cm. 0-89118-150-4 633.18 IMP RICE WHEATS PRODUCTIVITY SUSTAINABILITY. 029/2003