TY  - BOOK
AU  - Ladha, J. K.
ED  - Hill, J. E. 
TI  - Improving the Productivity and Sustainability of Rice -Wheat Systems : Issues and Impacts
SN  - 0891181504
U1  - 633.18 LAD 
PY  - 2003///
CY  - USA 
PB  - American Society of Agronomy
ER  -