{"title":"Effects of Sole and Integrated Application of Cocoa Pod Ash and Poultry Manure on Soil Properties and Leaf Nutrient Composition and Performance of White Yam","authors":"T. M. Agbede, A. O. Adekiya","volume":113,"journal":"International Journal of Agricultural and Biosystems Engineering","pagesStart":281,"pagesEnd":289,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10004417","abstract":"
Field experiments were conducted during 2013, 2014 and 2015 cropping seasons at Rufus Giwa Polytechnic, Owo, Ondo State, southwest Nigeria. The objective of the investigation was to determine the effect of Cocoa Pod Ash (CPA) and Poultry Manure (PM) applied solely and their combined form, as sources of fertilizers on soil properties, leaf nutrient composition, growth and yield of yam. Three soil amendments: CPA, PM (sole forms), CPA and PM (mixture), were applied at 20 t ha-1<\/sup> with an inorganic fertilizer (NPK 15-15-15) at 400 kg ha-1 <\/sup>as a reference and a natural soil fertility, NSF (control). The five treatments were arranged in a randomized complete block design with three replications. The test soil was slightly acidic, low in organic carbon (OC), N, P, K, Ca and Mg. Results showed that soil amendments significantly increased (p = 0.05) tuber weights and growth of yam, soil and leaf N, P, K, Ca and Mg, soil pH and OC concentrations compared with the NSF (control). The mixture of CPA+PM treatment increased tuber weights of yam by 36%, compared with inorganic fertilizer (NPK) and 19%, compared with PM alone. Sole PM increased tuber weight of yam by 15%, compared with NPK. Sole or mixed forms of soil amendments showed remarkable improvement in soil physical properties, nutrient availability, compared with NPK and the NSF (control). Integrated application of CPA at 10 t ha-1<\/sup> + PM at 10 t ha-1<\/sup> was the most effective treatment in improving soil physical properties, increasing nutrient availability and yam performance than sole application of any of the fertilizer materials.<\/p>\r\n","references":"[1]\tS.K. Hahn, D.S.O. Osiru, M.O. Akoroda and J.A. Otoo, \u201cYam production and its future prospects\u201d. Outlook Agriculture, 16(3):105-110, 1987.\r\n[2]\tC.A. Okoh, \u201cThe effect of mulching on soil physico-chemical properties and the yield of white yam\u201d, Tropical Journal of Root Tuber Crops, 4(2):24-31, 2004.\r\n[3]\tT.M. 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