Effects Of Water Table Management Practices On The Transport Of Nitrates In Sandy Underground Environment

Enhancing the degradation of agrochemical pollutants by managing the water table has introduced a new horizon in agricultural pollution control. Experimental work in this area shows that the degradation of agrochemicals such as nitrate is dependent on the soil water content. The aim of this study was to evaluate the effect of water table fluctuations on the nitrate and chloride transport. A set of laboratory column experiments was conducted to investigate the transport of two non-sorptive chemicals nitrate and chloride (N03, CI) to underground environment as effected by water table fluctuation. Three-controlled water table depths set at 0.25 m, 0.50 m, 0.75 m from the surface and free drainage treatment were used. The concentration curves for nitrate measured at different water table depths were not similar. The difference in the mean and the peak nitrate concentrations indicates highly significant difference in nitrate concentration among the water table depths. Through the values of mean and peak nitrate concentrations, the 0.25 m and 0.50 m water table depths gave the lowest mean and peak nitrate concentrations compared to the free drainage water table treatment. Descriptive statistical analysis indicates that there was highly

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