The Integrated Effects of Fertilizer on Sweet Potato (Ipomea Batatas, Lam.) in Andosol and Nitisol Soils

Sweet potato is a food and nutrition security crop in sub-Saharan Africa with low yields resulting from soil infertility. We examined the effects of nine fertilizer regimes on growth performance orange-fleshed (OFSP) white-fleshed (WFSP) sweet varieties two agro-ecological zones characterized by Andosol Nitisol soils. The treatments were: NPK20-10-10, NPK6-15-28, rice husk biochar (RHB), fast compost (FC), Tithonia diversifolia leaf powder, poultry litter (PL), RHB/NPK20-10-10, FC/NPK20-10-10 PL/NPK20-10-10. These were compared to control no fertilizer. soils acidic significant differences (p < 0.05) total nitrogen, organic carbon, C/N ratio, phosphorus, potassium, calcium magnesium. Fertilizer dominant adventitious root, marketable yields, moderately affecting main stem length harvest index (HI) weak branch number, petiole area (LAI). Soil type variety strongly affected HI. Variety × influenced root formation, while yields. LAI, primary dry biomass, best for OFSP Andosol, length, roots HI WFSP Nitisol. Results study showed that FC, PL/NPK20-10-10 RHB/NPK20-10-10 most promising fertility amendments boost productivity Nitisols Andosols.