Short-Term Integrated Application of Nitrogen, Phosphorus, Sulfur, and Boron Fertilizer and the Farmyard Manure Effect on the Yield and Yield Components of Common Bean (Phaseolus vulgaris L.) at Alle Special Woreda, Southern Ethiopia

In Ethiopia, the common bean (Phaseolus vulgaris L.) is an important grain legume with a high food and commercial value. Yet, its productivity is very low, which could be attributed to low levels of soil organic matter, nitrogen (N), phosphorous (P), sulfur (S), and boron (B), and insufficient fertilizer application. Therefore, a field experiment was conducted during the 2019 cropping season in Alle, Southern Ethiopia, to evaluate the agronomic and economic responses of blended NPSB (18.7N-37.4P2O5-6.9S-0.25B) and farmyard manure (FYM) for common bean production. Four NPSB-blended fertilizer rates (0, 50, 100, and 150 kg·ha−1) and three FYM rates (0, 2.5, and 5 tons·ha−1) were used in the experiment. The experiment was laid out using a randomized complete block design in a factorial arrangement with four replications. The result showed that NPSB and FYM significantly affected crop phenology, growth, yield, and yield components. Application of 100 kg·ha−1 NPSB along with 5 t·ha−1 FYM significantly increased the number of nodules, hundred seed weight, and grain production. The results also showed that using 100 kg·ha−1 NPSB fertilizer in combination with 5 t·ha−1 FYM produced the highest grain, which is about 173% higher grain yield than the control. Partial budget analysis indicated that application of 100 kg·ha−1 NPSB fertilizer with 5 t·ha−1 FYM resulted in the highest marginal rate of return (1308%) and the best net profit. Therefore, an integrated application of 100 kg·ha−1 NPSB fertilizer and 5 t·ha−1 FYM is suggested.