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Kibinesh Adimasu
Effects of Integrated Application of Vermicompost and Inorganic NP Fertilizer on Growth, Biomass Yield and Quality Components of Potato (Solanum tuberosum L.) Selected soil properties at Haramaya, Eastern Ethiopia
Abstract
Potato (Solanum tuberosum L.) is one of the most important tuber crops produced in Haramaya Eastern Ethiopia. However, production and productivity of the crop is constrained by Multinutrinet Dficiency. Hence, a field experiment is conducted in main cropping season in Haramaya Eastern Ethiopia to investigate the effects of integrated application of vermicompost and inorganic NP fertilizer on growth, biomass yield and quality components of potato tuber and selected soil properties. The treatment is comprised of factorial combinations of three rates of vermicompost (2.5, 5, 7.5 t ha-1) with three rates of inorganic NP 25 %, 50 %, 75 % mean that, (27.75, 55.5, 83.25 kg of N and 23, 46, 69 kg P2O5), full dose of vermicompost (7.5 t ha-1), recommended inorganic NP (111 kg N ha-1 and 92 kg P2O5 ha-1) and control treatments were laid as Randomized Complete Block Design (RCBD) with three replications. The result of this experiment revealed that integrated application of 75% inorganic NP and 7.5 t ha-1 vermicompost significantly increased date of flowering, date of physiological maturity, plant height, dry matter % , specific gravity and medium tuber size by 25.16 %, 27.61 %, 39.64 %, 89.42 %, 4.71 %, 73.28 % respectively as compared to the unfertilized plot. However date of emergence decreased by 15.97% compared to the control. However, stem number was not affected by the treatment. The result of this experiment also revealed that integrated application of 75% inorganic NP and 7.5 t ha-1 vermicompost increased the OC, total N and available P by 54.29 %, 242.86 % and 172.38 %, respectively as compared to the control. Therefore, the combined application of 7.5 t ha-1 vermicompost and 75 % inorganic NP was found to be the better integrated nutrient management for potato production in Haramaya University Eastern Ethiopia and other similar agro-ecologies for the improvement of potato production.
Keywords: Biomass Yield, Tuber Quality, Nitrogen, Phosphors, Vermicompost, Selected soil propertie
