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Yield and Nutrient Content of Sweet Potato (Ipomoea batatas) Responses to N.P.K 15:15:15 Fertilizer Complemented with Different Sources of Ash

O. C. Olejeme
M. O. Nwaigwe
K. F. Eluagu
A. B. Diobi
J. Diken


A trial on the complementary use of NPK 15.15.15 with different sources of ash materials as it affects the yield and nutrient content of sweet potato (Ipomoea batatas), was evaluated at the student's project site at Federal College of Agriculture, Ishiagu, Ebonyi State in the 2021 cropping seasons. The experimental design used was the randomized complete block design (RCBD) with five (5) treatments: NPK fertilizer 15:15:15, NPK fertilizer 15:15:15 + palm bunch ash (PBA), and NPK fertilizer 15:15:15 + rice husk ash (RHA), NPK fertilizer 15:15:15 + wood ash (WA), control (No fertilizer), each replicated three (3) times. Pre-planting physicochemical properties of the soils were determined to know the soil status before planting. Tuber yield, moisture, dry matter and nutritional content were determined at (P≤0.05). The best yield performance of 18.9 tons/ha was recorded from the plots amended with the integration of NPK+ RHA. The highest value of % protein, % ash and % fibre, were also gotten from the integration of NPK+ RHA. It is therefore recommended that farmers integrate NPK fertilizer with ash especially rice ash dust to reduce soil acidity and toxicity, which in the long run will increase crop yield.