Ethiopian soils are recently reported to exhibit multi-nutrient deficiency. Legume crops can satisfy their nitrogen (N) demand through biological N fixation. However, other nutrients should be supplied in optimal amount in the form of fertilizers. Thus, this study was conducted to evaluate the response of faba bean to different levels of phosphorus (P) and potassium (K) fertilizers. The study was conducted in Sekela district of West Gojam Zone of Amhara region from 2014 to 2015. Four levels of K (0, 12, 24 and 36 K2O kg ha-1) and five levels of P (0, 23, 46, 69 and 92 kg P2O5 ha-1) in the first year and four levels of P (0, 23, 46 and 69 kg P2O5 ha-1) in the second and third years were combined in incomplete factorial arrangement with a satellite treatment comprising S, Zn, Mg and B. Except the control treatment (non-fertilized), all the rest treatments were inoculated with FB-4 in the first year and EAL-110 rhizobia bacteria in the second and third experimental years. The treatments were laid in a randomized complete block design with three replications. P, K, S and Mg fertilizers were applied as basal application, while, the micronutrients Zn and B were applied as foliar application 45 days after planting. Significant (P<0.05) yield response to the addition of P and K fertilizers was recorded in two experimental years. In the first experimental year, the highest grain of 3.2 t ha-1 was obtained from application of 92/24 P2O5/K2O kg ha-1 statistically at par with 46/0 P2O5/K2O kg ha-1. While, in the second experimental year, the maximum grain yield of 4.3 t ha-1 was obtained from application of 46/0 P2O5/K2O kg ha-1. The partial budget analysis result showed that the maximum marginal rates of return of 611 and 463.5% and maximum net economic returns of 1768.1$ and 2975.2$ were obtained from application of 46 kg P2O5 ha-1 in the first and second experimental years, respectively. Thus, the combined use of the rhizobia strains FB-4 and EAL-110 with 46 kg P2O5 ha-1 is recommended to improve productivity and economic return of faba bean production in Sekela district and similar agro-ecologies.
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