@PROCEEDINGS {KANG:1975d, title = {Interaction of fertilizer use on cowpea (Vigna unguiculata(L.) walp) and Soybean (Glycine max. (L.) Merrill) Nodulation and Nitrogen fixation in the lowland tropics}, author = {Kang, B. T. and Nangju, D. and Ayanaba, A. }, booktitle = {Presented at the Conference on Biological Nitrogen Fixation in Farming System of the Humids Tropics}, year = {1975}, }