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Qualidade físico-química das águas utilizadas no Perímetro Irrigado Cachoeira II, Serra Talhada, Pernambuco

2009; UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; Volume: 4; Issue: 1 Linguagem: Inglês

10.5039/agraria.v4i1a5

1981-1160

Josimar Gurgel Fernandes, Maria Betânia Galvão dos Santos Freire, Jaílson Cavalcante Cunha, Josiclêda Domiciano Galvíncio, M. M. Correia, Patrícia Ribeiro dos Santos,

Water Quality and Pollution Assessment

Aiming to characterize the waters used for irrigation in Cachoeira II Irrigation Perimeter, as well as to evaluate the variation of the water quality along the year, water samples were collected from the main irrigation water sources (Cachoeira river, Pajeú river and wells), at each three months during one year.Physical and chemical analyses (electric conductivity, pH, cations and anions) were carried out and the results, analyzed by descriptive statistics. The waters showed sodium-chlorine predominance, independently of the salinity level, places and sources of origin. The waters used for irrigation showed high risk of salinization and sodification, due to the high levels of sodium and chloride. pH values were within the normal limits (6.5 to 8.4), however, the waters from wells presented Cl- concentrations higher than 3 mmolc L-1, with average values of 19.53 mmolc L-1. The highest average values of RAS were observed in the third sampling time, at the end of the dry season, in all analyzed water sources. The waters from wells presented high CE values at all sampling times, representing a risk for many crops of economic value.