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This study was conducted at the National Root Crops Research Institute, Umudike experimental field to determine the effects of incorporation of cow dung and NPK 15:15:15 fertilizer on ginger yield and economics of production. The treatment factors comprise of four rates of cow dung, 0 t/ha, 4 t/ha, 8 t/ha and 12 t/ha and four rates of NPK 15:15:15 fertilizer (0 kg/ha, 100kg/ha, 200 kg/ha and 300 kg/ha). Results obtained indicate that incorporation of cow dung and NPK 15:15:15 significantly (P<0.05) enhanced tiller and leaf production. Maximum yield of ginger when cow dung was applied sole was 6.98t/ha at the rate of 12t/ha of cow dung while maximum yield when NPK 15:15:15 was applied soil was 5.64t/ha at the rate of 200kg/ha of NPK 15:15:15. The incorporation of NPK 15:15:15 and cow dung increases yield of ginger significantly. For optimum yield in ginger production the combination of cow dung and NPK 15:15:15 at the rate of 8t/ha and 200kg/ha respectively was recommended. The gross margin analysis showed that applying cow dung alone at 12t/ha gave the maximum return on investment of 58% and NPK 15:15:15 applied as sole had the maximum return on investment of 17% at the rate of 200kg/ha. The optimum gross margin (₦989.53/ha) with return on investment of 62% was obtained from incorporation of 8t/ha of cow dung and NPK 15:15:15 at 200kg/ha. Based on productivity and gross margin analysis, the study recommends the incorporation of cow dung and NPK 15:15:15 at the rates of 8t/ha and 200kg/ha respectively to improve yield and profitability of ginger production.
Keywords: Gross margin, Inorganic Leaves, manure, Organic manure, Tillers and Zingiber officinale