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Effects of Rhizobial inoculant and nitrogen fertilizer on yield and nodulation of common bean

Abstract A two‐year field experiment was conducted to determine if using mixed strains of Rhizobium inoculant and starter nitrogen (N) fertilizer could improve yield and nodulation of four common bean varieties on a Vertisol at Alemaya, Ethiopia. A granular mixed inoculant of CIAT isolates 384, 274, and 632 and a starter N fertilizer at a rate of 23 kg N ha‐1 (50 kg urea ha‐1) were applied separately at planting. Inoculation with mixed strains and starter N fertilizer gave a significantly higher grain yield, nodule number, and dry matter yield for most varieties used. Both grain yield and dry matter yield showed a significant correlation (r=0.93 and r=0.87; P<0.05 for grain yield and dry matter yield, respectively, for 1991 crop season and r=0.90 and r=0.86; P<0.05 for grain yield and dry matter yield, respectively, for 1992 crop season) with nodule number. It is recommended that resource‐poor farmers adopt the practice of using a Rhizobium inoculant or starter N to improve common bean yields in the Hararghe highlands, Ethiopia.