Caracterização das águas subterrâneas usadas na irrigação de hortaliças em comunidades rurais no Município de Pombal / PB.

Abstract

The intensive agriculture developed has different environmental impacts on water quality. It is therefore necessary to monitor several quality indicators and including the assessment of pesticide residues. The work aims to study the quality of groundwater used for irrigation for vegetable production located in the Community of Lowland Long Calf Olives and the City of Pombal / PB, considering its use for irrigation. Was developed in the municipality of Pombal / PB, through visits in the communities of Long Lowland Olive Calf and working with the production of vegetables irrigated with groundwater from wells in the region, 19 water samples were collected and analyzed in situ and referred to the analysis of soil and water (IFPB / Sousa) laboratory. A reduction in the electrical conductivity of the water since February, a period marked by the onset of the rains, demonstrating the effect of rainwater dilution of salts. The Piranhas River showed higher turbidity from February, as rains in this period can revolve the materials deposited on the river bottom and drag those in the riverbed. Two salts were studied, bicarbonate ion was showed the highest values in water, wells 4, 6 and 10 showing 11.3, 10.34 and 10.42 mmol L-1. Sodium chloride and the presented results ranging from 0.4 to 2.7 mmol L-1 and 0.2 and 3.68 mmol L-1, respectively, causing no concern for use in irrigation, taking into account a management efficient irrigation . The sodium adsorption ratio showed the highest values in four wells (2.67 mg L-1) and 13 (2.6 mg L1).