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Improving biological nitrogen fixation (BNF) by groundnuts grown in acid soils through amendment with calcitic and dolomitic limestones

R. Merckx · J.K. Ogega · J.R. Okalebo · D.K. Okello · D.A. Onyango · C. Othieno · A.N. Otinga · P. Pypers · B.A. Were