Analise Comparativa Da Qualidade De Água Para Irrigação Em Três Sistemas Hídricos Conectados No Semiárido

Abstract

Knowledge of the total content of soluble salts present in the water and the behavior of their dominant ions allows the use and management more adequately in use for irrigated agriculture. In this context, this study aimed to evaluate the dynamics of salts in surface and ground water for irrigation purposes in three water systems in the Brazilian semiarid region: the Trussu weir, the perennial Excerpt from Trussu river and wells located along the river valley perennial. The study area is located in the basin of Alto Jaguaribe in the city of Iguatu, Ceará, Brazil. Samples were collected from March 2013 to March 2015, a total of 10 collections in 14 sampling stations. The parameters monitored were: sodium, calcium, magnesium, bicarbonate, carbonate, chloride and sulfate, the sodium adsorption normal ratios were calculated and corrected, besides the electric conductivity. Then applied the Piper diagram in the definition of the water classes. The waters were classified as chlorinated contains calcium, bicarbonated contains calcium, bicarbonated sodium for surface and ground water and chlorinated sodic into groundwater. Regarding the classification for irrigation results showed that surface water showed low risk of generating salinity problems, since the underground showed a risk of medium to high risk of causing salinity. As for sodicity surface water present no problems, since the underground are with sodicity problems can only be used on soils with adequate management of salts.