Abstract
A study was conducted to examine the impact of land use and agrochemicals on wetland soil quality of Odeda Farm Institute, Eweje, Ogun State, Nigeria. The land use types studied were maize, plantain, rice, vegetable, and fallow. Five profile pits were dug, four at agrochemicals applied fields and one at fallow field as control. The results showed that soil texture was not influenced by land use and agrochemicals. The particle size distribution data showed that the soils consisted of high sand content (>600 g/kg). Soil pH, organic carbon and total nitrogen were low at agrochemicals applied fields when compared with the fallow field. The reverse is the trend for available P which is low at the fallow field due to non application of phosphate fertilizer. The heavy metals (Cd, Cu, Fe, Mn, Pb and Zn) results differed significantly (p<0.05) between the agrochemicals applied fields and the fallow field. Soil nutrients depletion and heavy metal accumulation were very prominent under agrochemicals applied fields. However, the impact of land use and agrochemicals which mostly accounted for major changes in the soil quality indicators can be immediate or long term, and wetland users should take into consideration long effect of current land decisions.
Highlights
The desire to meet up with the food demands of looming populace in the world, wetlands which occupy 6% of the world’s land surface are valuable ecosystems considered to achieve the goal [1]
The soils have weak to moderate crumb subangular blocky peds, nonsticky friable loose to sticky firm hard consistence, and this is Osinuga, Olufemi Adewale and Oyegoke Clara Olabisi: Impact of Land Use and Agrochemicals on Quality Potential of Wetland Soils of Odeda Farm Institute, Eweje, Ogun State, Nigeria attributed to high clay and low organic matter contents
The results of this study revealed that land use and agrochemicals had significant effects on the quality of the wetlands in the study area thereby making soil polluted
Summary
The desire to meet up with the food demands of looming populace in the world, wetlands which occupy 6% of the world’s land surface are valuable ecosystems considered to achieve the goal [1]. This is so, since wetlands are crucial to life-support functions, human health and the natural environment [2]. Agricultural use of wetlands has increased significantly in many developing countries in Africa [5] This increase is driven partly by population increase, upland soil deterioration, economic and financial motivation [6], as well as increasing issue of food security in developing countries like Nigeria [7]. Production from the uplands cannot meet the increasing population food demand; wetlands may be the most logical environment in which to close the gap because, physical conditions for cropping within wetland/inland valley are more favourable than uplands since there is more water in this ecosystem [8]
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