EFFECTS OF COCOA POD HUSK ASH AND NPK FERTILIZER ON SOIL NUTRIENT STATUS AND SWEETPOTATO YIELD IN AN ULTISOL IN SOUTHEASTERN NIGERIA

Abstract: The single effects of cocoa pod husk ash (CPHA) - 5 tons per hectare, NPK (15-15-15) and their combinations were evaluated on soil chemical properties and yield of sweetpotato (Ipomoea batatas L. (Lam) in an Ultisol in Southeastern Nigeria. The treatments were: 5 tons/ha of Cocoa pod husk ash (A), 200 kg/ha of NPK Fertilizer + 5 tons/ha of Cocoa pod husk ash (B), 300 kg/ha of NPK Fertilizer + 5 tons/ha of Cocoa pod husk ash (C) 200 kg/ha of NPK Fertilizer (D), 300 kg/ha of NPK Fertilizer (E) and No treatment –Control (F). All the applied treatments increased soil pH except the sole application of 200 kg/ha NPK fertilizer, which reduced the soil pH than what it was before treatment application. Other soil nutrients such as % organic carbon, % total nitrogen and exchangeable potassium were increased when 5 tons CPHA was combined with 200 kg/ha NPK fertilizer. While 300 kg/ha NPK applied singly significantly increased soil Available P after harvest. Saleable tubers of sweetpotato were significantly (P<0.05) higher in plots treated with 200 kg of NPK fertilizer combined with 5 tons/ha CPHA, followed by treatment with 300 kg/ha of fertilizer combined with 5 tons/ha of CPHA. 200 kg of NPK fertilizer combined with 5 tons/ha CPHA is therefore recommended.

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[Akinmutimi, A.L (2014); EFFECTS OF COCOA POD HUSK ASH AND NPK FERTILIZER ON SOIL NUTRIENT STATUS AND SWEETPOTATO YIELD IN AN ULTISOL IN SOUTHEASTERN NIGERIA Int. J. of Adv. Res. 2 (2). 0] (ISSN 2320-5407). www.journalijar.com

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