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Influence of wastewater on the Physical-chemicals Properties of Soil

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 Dallas, Texas, July 29 - August 1, 2012  121340643.(doi:10.13031/2013.41929)
Authors:   Vanessa Ribeiro Urbano, Thaís Grandizoli Mendonça, Maria Leonor R. C. L Assad, Reinaldo Gaspar Bastos, Claudinei Fonseca Souza
Keywords:   salinity, sodicity, fertigation, reuse of water

The demand for good quality water results on the necessity of alternatives to replace the use of potable water in activities that allows poor quality water. Due to this necessity comes the reuse of wastewater. The alterations on the hydraulic conductivity and the monitoring of salinity and sodicity of dystrophic Red Latosol soil irrigated with wastewater were the objective of this study. Conducted on the Center of Agricultural Sciences of UFSCar, at Araras/SP/Brazil, 18 undisturbed soil samples were collected and disposed on a constant head permeameter to simulate 5 cycles of Lettuce culture, which were organized in five different treatments and one control group. For each treatment was applied 0.580L; 1.160L; 1.740L; 2.320L and 2.900L of wastewater respectively to supply the water demand for the crop. The wastewater used on this study comes from the treatment of domestic waste with wetland. After the flow of water passed through the soil, samples of water and soil were collected. The hydraulic conductivity of soil decreases, but this was not injurious to the infiltration of water and nutrients in the soil, preserving the original density. It is worth mentioning that the salinity and sodicity should be monitored, because the soil samples retained the salts contained in the wastewater. From this study it was possible to conclude that the utilization of wastewater causes decrease on the hydraulic conductivity of the soil, however with no harm, while the electrical conductivity must be monitored constantly because there are risks of salinization of the soil.

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