caa a22 4500 477111157 CHVBK 20180405111609.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF00011649 doi (NATIONALLICENCE)springer-10.1007/BF00011649 Evaluation of symbiotic properties and nitrogen contribution of mucuna to maize grown in the derived savanna of West Africa [Elektronische Daten] [N. Sanginga, B. Ibewiro, P. Houngnandan, B. Vanlauwe, J. Okogun, I. Akobundu, M. Versteeg] The severity and increase of the Imperata cylindrica constraint as a weed, the decline of the traditional fallow systems as a means of soil fertility management and the lack of inorganic fertilizer appear to have created opportunities for adoption of mucuna (Mucuna pruriens) technology by smallholder farmers in some areas in the derived savanna of West Africa. What is not known, however, is the extent to which the establishment and N contribution of mucuna in these areas depend on symbiotic properties such as effective nodulation and mycorrhizal infection. Short term surveys carried out in 34 farmer's arable fields located in four different sites in the derived savanna, southern Benin, West Africa, together with results of greenhouse and field experiments showed that mycorrhizal infection rate of mucuma ranged from 2 to 31% and correlated positively with nodulation and shoot dry matter production. Nodulation occurred in 79% of the fields with numbers of nodules ranging from 0 to 135 plant−1. Mucuna responded both to inoculation and N fertilizer in degraded soils but growth response depended on the rhizobia strains and mucuna varieties. Mucuna accumulated in 12 weeks about 313 kg N ha−1 as either a sole crop or 166 kg N ha−1 when mixed/intercropped with maize, respectively. Across all cropping systems it derived an average of 70% of its N from atmospheric N2 (estimates made by the 15N isotope dilution method), representing 167 kg N ha−1 per 12 weeks in the field. Mucuna interplanted with maize obtained a greater proportion of its nitrogen (74%) from fixation than did mucuna grown alone (66%) suggesting that competition for soil N influences the proportion of nitrogen fixed by mucuna. The total amount of N2 fixed per hectare was, however, reduced significantly by intercropping mucuna with maize. A preceding mucuna crop provided a maize yield equivalent to 120 kg N kg ha−1 of inorganic N fertilizer. Kluwer Academic Publishers, 1996 herbaceous legumes nationallicence moist savanna nationallicence mycorrhiza nationallicence nodulation nationallicence nitrogen fixation nationallicence Sanginga N. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut Ibewiro B. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut Houngnandan P. Institut National des Recherche Agricoles du Benin (INRAB), BP 884, Cotonou, Republique du Benin aut Vanlauwe B. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut Okogun J. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut Akobundu I. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut Versteeg M. Station de Recherche du Benin, IITA, BP 08-0932, Cotonou, Republique du Benin aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 179/1(1996-02-01), 119-129 0032-079X 179:1<119 1996 179 11104 https://doi.org/10.1007/BF00011649 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011649 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sanginga N. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut NATIONALLICENCE 700 1- Ibewiro B. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut NATIONALLICENCE 700 1- Houngnandan P. Institut National des Recherche Agricoles du Benin (INRAB), BP 884, Cotonou, Republique du Benin aut NATIONALLICENCE 700 1- Vanlauwe B. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut NATIONALLICENCE 700 1- Okogun J. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut NATIONALLICENCE 700 1- Akobundu I. International Institute of Tropical Agriculture ITA, Oyo Road, PMB 5320, Ibadan, Nigeria aut NATIONALLICENCE 700 1- Versteeg M. Station de Recherche du Benin, IITA, BP 08-0932, Cotonou, Republique du Benin aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 179/1(1996-02-01), 119-129 0032-079X 179:1<119 1996 179 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer