00861nam a2200229ua 4500003001000000005001700010008004100027020001800068040003000086245010000116260003600216500014100252504004400393650001600437650001700453650003100470650001800501655001000519700002400529700002400553710005400577AR-SsjUCA20250716140543.0250228s1977    xxu           000 0 eng d  a0-471-99499-5  aAR-SsjUCAbspacAR-SsjUCA00aBiological nitrogen fixation in farming systems of the tropics /cby A. Ayanaba and P. J. Dart.  aChichester, NY :bWiley,c1977.  a"Based on papers presented at a Symposium held at the International Institute of Tropical Agriculture, Ibadan, Nigeria, in October 1975.  aBibliografía al final de capítulos. 4aAgricultura 4aConferencias 4aFijación del nitrógeno 4aZona tropical 4aTexto1 aAyanaba, A.eeditor1 aDart, P. J.eeditor2 aInternational Institute of Tropical Agriculture.