Avaliação do uso e ocupação do solo sobre a qualidade da água em área de produção agrícola de hortaliças

Abstract

Water quality is a worldwide concern and its multiple uses are indispensable to a wide range of human activities. The present study provides a water quality diagnosis of the Long water stream located in the Santa Rita de Cassia District, Barra Mansa, RJ. This stream is used for irrigation of the entire horticulture area, approximately 160 properties. To determine the water quality, water samples were collected along the stream. Physical-chemical and microbiological analyzes were performed. With these data the IQA, the EIT and water quality for irrigation were evaluated, besides evaluating the glyphosate agricultural defensive content. From the analyzed points the point C4 was considered only point that presented worse quality, being this fact related to the effluents and the agricultural activity. The amount of iron was high in both soil and water. The presence of the iron in the water is a reflection of the amount of iron accumulated in the soil and drained to the water resource. The IQA of the points A1, C4 and C5 were analyzed and presented qualities compatible with the sites, with A1 being considered excellent and C4 considered to be poor, C5 was considered medium. The EIT was considered to be optimal at all points analyzed. The water quality for irrigation was considered good, with no risk of soil salinization, and greater attention should be paid to the amount of iron at points A1, C4 and C5