Análise dos efeitos nocivos do uso de defensivos agrícolas no entorno da localidade morro redondo, zona rural de Corrente - PI

Abstract

The quality and affluence of surface waters are closely linked to the agricultural / economic activities present in the watersheds of a given region. Considering the strong increase in the use of agrochemicals that favors the degradation of soil and water, especially in regional agricultural watersheds. In this sense, a case study was carried out with the aim of detecting possible pollutants from the use of agrochemicals in the tributaries of the Corrente, Paraim and Prata rivers, both located in the vicinity of Morro Redondo, in the rural area of Corrente- PI. Preventing the contamination of these watersheds is essential to guarantee water quality and reduce the risk of contamination of the local population, who are immediately exposed to such risks, since the rivers researched here are the source of local supply. Therefore, it is necessary to identify how the use and occupation of the soil in the locality are impacting the water resources, their quality and their hydrological balance. Several methods were applied to analyze the conditions in which the locality and its rivers meet, being these interviews, semi- structured questionnaires and an on-site visit for the collection and investigation of the tributaries in question. The samples collected for analysis were sent to the Laboratory of Water, Soil and Biology of the Federal Institute of Piauí, where water quality parameters were measured, such as pH, dissolved oxygen, total phosphorus, nitrite, ammonia, temperature, conductivity thermotolerant and fecal coliforms. The results obtained were compared with the maximum values allowed by ordinance nº 2,914 / 2011. After the analysis, it was possible to verify that the water quality of the rivers Prata and Paraim is in poor condition, recommending that the competent bodies, both municipal and state, take measures of recovery and environmental preservation of its tributaries to to recover and preserve both the rivers and the population that uses them for their subsistence.