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Serraj, R and Gyamfi, J A and Rupela, O P and Drevon, J J (2004) Improvement of legume productivity and role of symbiotic nitrogen fixation in cropping systems: Overcoming the physiological and agronomic limitations. In: Symbiotic Nitrogen Fixation Prospects for Enhanced Applicationin Tropical Agriculture. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 67-97. ISBN 8120416147
Serraj, R and Gyamfi, J A and Rupela, O P and Drevon, J J (2004) Improvement of legume productivity and role of symbiotic nitrogen fixation in cropping systems: Overcoming the physiological and agronomic limitations. In: Symbiotic Nitrogen Fixation Prospects for Enhanced Applicationin Tropical Agriculture. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 67-97. ISBN 8120416147
Serraj, R and Gyamfi, J A and Rupela, O P and Drevon, J J (2004) Improvement of legume productivity and role of symbiotic nitrogen fixation in cropping systems: Overcoming the physiological and agronomic limitations. In: Symbiotic Nitrogen Fixation Prospects for Enhanced Applicationin Tropical Agriculture. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 67-97. ISBN 8120416147
Serraj, R and Gyamfi, J A and Rupela, O P and Drevon, J J (2004) Improvement of legume productivity and role of symbiotic nitrogen fixation in cropping systems: Overcoming the physiological and agronomic limitations. In: Symbiotic Nitrogen Fixation Prospects for Enhanced Applicationin Tropical Agriculture. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 67-97. ISBN 8120416147