TY  - BOOK
AU  - O. P. Rupela
AU  -  D. Johansen  D. F. Herridge
TI  - Extending nitrogen fixation research to farmers fields
SN  - 92-9066-378-2
U1  - 589.95 
PY  - 1997///
CY  - Patanacheru
PB  - International Crops research  Institute for the Semi-Arid Tropics
ER  -