Influence of Tillage Practices and Nutrient Application Rates on Performance of Cassava in Coastal Plain Sand, Etinan, Akwa Ibom State
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This research was conducted to assess the performance of cassava (Manihot esculenta Crantz) under two tillage practice integrated with organic and inorganic fertilizers in 2022 and 2023 cropping seasons in Etinan, Akwa Ibom State, Nigeria. Initial soil samples were collected and analyzed for physicochemical properties. The experiment was a factorial arranged in a randomized complete block design, with treatments consisting of two tillage practices (conventional and reduced tillage), and eight fertilizer combinations (T1: NPK 15:15:15 400kgha -1 , T2: poultry manure (PM) 5 tha-1, T3: microbial fertilizer (Bio fertilizer) 40l kgha-1,T4: NPK 400 kgha-1 + PM 5 tha-1, T5: NPK 400 kgha-1 + PM 2.5 tha-1, T6: NPK 400 kgha-1 + CHC 240l kgha-1, T7: NPK 400 kgha-1 + CHC 120l kgha-1 T8: 0) replicated three times to give a total of 48 experimental units. In both cropping years, amended soils and those under different tillage methods showed significant (p < 0.05) difference in cassava P nutrient accumulation, while for cassava K and N nutrient accumulation only 2022 cropping season showed significant (p < 0.05) difference between the various treatments. The 2023 cropping year (residual effect) produced cassava with the heaviest dry roots, highest number of roots, heaviest fresh tubers and increased yield, which were associated with soil amended with NPK 15: 15: 15: 400 kgha-1 + PM 2.5 tha-1. Hence, to optimize cassava yield on coastal plain sand, the integration of NPK 15: 15: 15: at 400 kgha-1 + PM 2.5 tha-1 using conventional tillage will give a better yield.
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