Cowpea ( Vigna unguiculata (L.) Walp.) is a one of the older plants cultivated by man. In Senegal it is widely cropped and it plays an important role in human nutrition and the economy. The cultivated areas of this legume span the country, with 93% in the North and the Center-North, and 7% in the South. They are situated in sahelian to guineo-soudanian ecological regions with 300 to 800 mm rainfall per year, respectively. In this work, we present a study of diversity of indigenous Bradyrhizobium nodulating the cowpea.

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