@PROCEEDINGS {NANGJU:1975e,
title = {Interaction of fertilizer use on cowpea ( Vigna unguiculata (L.) Walp.) and Soybean (Glycine max. (L.) Merill) Nodulation and Nitrogen fixation in the Lowland Tropics},
author = {Nangju, D. and Kang, B. T. and Ayanaba, A. },
booktitle = {Presented at Conference on Biological Nitrogen Fixation in Farming Systems of the Tropics},
year = {1975},
publisher = {IITA},
}