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Effects of cropping systems, maize residues application and N fertilization on promiscuous soybean yields and diversity of native rhizobia in Central Kenya

Herrmann Laetitia, Chotte Jean-Luc, Thuita Moses, Lesueur Didier. 2014. Effects of cropping systems, maize residues application and N fertilization on promiscuous soybean yields and diversity of native rhizobia in Central Kenya. Pedobiologia, 57 (2) : pp. 75-85.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q3, Sujet : SOIL SCIENCE / Quartile : Q3, Sujet : ECOLOGY

Abstract : Agriculture intensification has resulted in severe soil nutrient depletion in Africa. Alternative agricultural practices have been promoted to reduce the use of expensive mineral fertilizers and to restore and sustain soil fertility. The use of mineral fertilizer combined with organic inputs (such as crop residues) and different cropping systems (cereal-legume association or rotation) have been particularly promising. Impacts of these agricultural practices on soil communities have been widely studied, yet little is known on the effect on more specific groups such as rhizobia. A field trial was set up in Chuka (Kenya) to assess the impact of different cropping systems (maize and soybean in intercropping, rotation or monocropping) combined with N fertilization and residues application on the genetic diversity of promiscuous soybean rhizobia during two seasons. Soybean yields were severely reduced by moisture stress and the association with maize compared to mono-legume and rotation systems. Nodulation was generally low but was positively affected by residues application. Diversity of native rhizobia was very low (Shannon indices H_ < 0.8) across the experiment and was not affected by the treatments. Only 5 IGS profiles were obtained after RFLP analysis and all isolated rhizobia were identified as Bradyrhizobium elkanii. The distribution of the different IGS groups within the experiment was more affected by season and residues application than by cropping system and nitrogen fertilizer application. These results suggest a limited population and a low diversity of indigenous rhizobia, and emphasize the need of alternative managements to increase and sustain soybean yields in Central Kenya. (Résumé d'auteur)

Mots-clés Agrovoc : Système de culture, Glycine max, Zea mays, Résidu de récolte, Engrais azoté, Rendement des cultures, Rhizobium, nodosité racinaire, Bradyrhizobium, Rotation culturale, Culture intercalaire

Mots-clés géographiques Agrovoc : Kenya

Classification Agris : F08 - Cropping patterns and systems
F04 - Fertilizing
P34 - Soil biology
Q70 - Processing of agricultural wastes

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Herrmann Laetitia, TSBF (KEN)
  • Chotte Jean-Luc, IRD (FRA)
  • Thuita Moses, TSBF (KEN)
  • Lesueur Didier, CIRAD-PERSYST-UMR Eco&Sols (THA) ORCID: 0000-0002-6694-0869

Source : Cirad - Agritrop (https://agritrop.cirad.fr/572941/)

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