Micronutrient distribution in soils of Ethiope region of Delta State, Nigeria

Abstract

Investigation was carried out in Ethiope Region of Delta state, Nigeria to evaluate the distribution of micronutrients contents of oxisols. Ten farming communities were purposely selected in the region, and a total of 60 composite samples were collected with the aid of augers at a depth of 0 - 30 cm. The samples were air-dried at room temperature, sieved with 2 mm sieve mess before subjecting to laboratory analysis following standard procedures to determine the selected soil micronutrients (Fe, Cu, Mn, Zn). Data obtained were analyzed with descriptive statistics and analysis of variance while the least significance difference (LSD) at 5 % probability level was used to separate means. The relationship among nutrient parameters was shown with correlation analysis Results obtained indicated that the soils were moderate to slightly acidic, low in organic carbon and total nitrogen with medium contents of available P. Iron and Mn were found to be above the critical limits for crop production. At the same time, Cu and Zn were generally low. The high level of Fe might be a potential environmental problem upon complex reactions that will result in plinthite and hard pan formation that can restrict rooting and causing infiltration problem in the region. From the findings, it is advisable to apply organic fertilizers to boost the fertility of the soil and probably prevent plinthic layers development.