Estimating N2 fixation and N derived from soil by Casuarina equisetifolia using labelled 15N fertilizer: some problems and solutions Sougoufara, B. Danso, S.K.A. Diem, H.G. /Dommergues, Yvon FIXATION BIOLOGIQUE DE L'AZOTE ESTIMATION BIOMASSE HERBACEE NODULE METHODOLOGIE 1990 text https://www.documentation.ird.fr/hor/fdi:010014189 fdi:010014189 Sougoufara B., Danso S.K.A., Diem H.G., Dommergues Yvon. Estimating N2 fixation and N derived from soil by Casuarina equisetifolia using labelled 15N fertilizer: some problems and solutions. 1990, 22 (5), 695-701 EN SENEGAL