ISSN 2360-7971
Abstract: The study examined three rhizobia strains and one inorganic phosphorous fertilizer. The treatments consist of negative control (T1), rhizobia MAR-1495-SB (T2), rhizobia SB12 (T3), TAL 379 (T4), rhizobia MAR-1495-SB+50kg DAP (T5), rhizobia SB12+50kg DAP (T6), and Rhizobia TAL 379 +50kg DAP (T7). The researchers laid out the treatments in a randomised complete block design with three replications. The analysis of variance revealed that rhizobia had non-significantly (P > 0.05) affected grain yield. The rhizobia MAR-1495-SB biofertilizer at Asossa district recorded the maximum grain yield of 2187.9 kg ha-1. The application of MAR-1495-SB rhizobia biofertilizer had the highest net benefit of 26,094.8 ETB, followed by rhizobia MAR-1495-SB+50kg DAP biofertilizer, which also had a total of 23,518.6 ETB net benefit at Asossa district. The application of MAR-1495-SB rhizobia biofertilizer had the highest net benefit. Therefore, The researchers recommended the treatment MAR-1495-SB rhizobia since it produced a high marginal rate of return, a high net benefit, and a relatively small total cost of production for soybean production in the Asossa area.
Keywords: Rhizobia, inoculant, strain, net benefit, and marginal rate of return