Determination of Nitrogen and NPSB Fertilizer Rate on Production of Sweet Potato (Ipomoea batatas (L.) Lam) Yield and Yield Components in Bako and Wayu Tuka Districts, Western Oromia, Ethiopia.

Sweet potatoes are the most important root crop in several African countries, including Ethiopia. Nevertheless, its development is hampered by the nutrients in soil and plant materials. To address these problems, a field study was conducted in the districts of Bako and Wayu Tuka during the ۲۰۲۳/۲۰۲۴ growing season to assess how fertilizer rates affected root yield and yield parameters. Four nitrogen levels (۲۳, ۴۶, ۶۹, and ۹۲) and three levels of NPSB kgha⁻¹ (۱۰۰, ۱۵۰, and ۲۰۰) fertilizer rates were used in the experiment. It was set up in three replications using a factorial arrangement, RCBD. The study examined the effects of nitrogen and NPSB fertilizer rates on vine length, vine internode length, petiole length, storage root thickness, large root diameters, large root width, and storage root yield (۵۷۸۸۴ kg ha⁻¹) and recorded them from ۶۹ kg N and ۲۰۰ and ۱۰۰ kg NPSB ha⁻¹ at the Bako and Gute sub-sites, respectively. The application of ۶۹ ha⁻¹ nitrogen and (۲۰۰ and ۱۰۰) kg ha⁻¹ The NPSB fertilizer rate resulted in the highest yield of sweet potatoes (۶۱,۱۴۲.۸۶ & ۹,۹۰۵ kg ha⁻¹) from the Bako and Gute locations, with the highest net benefit of ۱,۲۰۹,۱۳۶ & ۱۸۸,۲۸۴.۲۰ ETB ha⁻¹ with an acceptable marginal rate of return. According to the study's findings, sweet potato productivity and profitability in the Midland agro-ecologies of western Ethiopia are greatly increased by supplementing the optimum amount of nitrogen and NPSB fertilizer rates.

کلیدواژه ها:

Economy analysis ، nitrogen ، NPSB fertilizer ، Root Yield ، Sweet potato