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In Ethiopia, common bean (Phaseolus Vulgaris L.) is usually grown by smallholder farmers and its average yield is low. The low yield of common bean in Ethiopia is attributed to several production constraints, which include poor agronomic practices such as low soil fertility management, untimely and inappropriate field operations, rainfall variability and diseases and insect pests. Hence, a field experiment was conducted in Adola sub-site of Bore Agricultural Research Center during the 2016-2017 main cropping seasons to determine optimum phosphorus rates in blended NPS and appropriate inter-row spacing for common bean production. The factors studied were four rates of phosphorus in blended in NPS (0, 50, 100 and 150 kg ha-1) that contain 19% N, 38% P2O5 and 7% S and four inter row spacing of common bean (30, 40, 50, 60 cm). These were laid out in a factorial arrangement in randomized complete block design with three replications. Significantly the highest number of plant height (51.84 cm), number of total pods per plant (8.64), days to maturity (93.92), hundred seed weight (60.62) and grain yield (2494 kg ha-1) were recorded at the highest rate of 150 kg P ha-1 whereas highest number of days (40.33 days) to reach flowering was recorded due to nil application. Among the inter-row spacing, 60 cm gave significantly the highest number of total pods per plant (9.25) and number of seeds per plant (2.99). The interaction of inter-row spacing and phosphorus rates had non-significant effect on almost all parameters except on number of primary branches per plant. Significantly the highest number of primary branches per plant (4.7) was recorded with nil application of P under wider inter-row spacing of 60 cm and it was statistically at par with P rates of 150 kg ha-1 for inter-row spacing of 40 cm. However, the highest net benefit (34167.56 Birr ha-1) was obtained from combination of inter-row spacing of 50 cm with application of 150 kg ha-1 NPS. Thus, it can be concluded that combined application of 150 kg ha-1 of P in blended NPS with variety Ibado proved to be superior and recommended for study area.

journal of plant biology and soil health

Effect of Phosphorus Rates in Blended Fertilizer (NPS) and Row Spacing on Production of Bushy Type Common Bean (Phaseolus Vulgaris L.) at Mid-land of Guji, Southern Ethiopia