Biological nitrogen fixation and sustainability of tropical agriculture : Proceedings of The Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), held at the International Institute of Tropical Agriculture

Biological nitrogen fixation and sustainability of tropical agriculture : Proceedings of The Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), held at the International Institute of Tropical Agriculture text New York : John Wiley Sons, 1992 nitrogenpertanian URN:ISBN:0471935603