Avaliação das modificações nas propriedades físico-químicas de um solo pelo uso de esgoto doméstico tratado na irrigação de coqueiros

Abstract

This research aimed to study the possible impacts on soil due to the irrigation of coconut trees with treated wastewater. The study was conducted in a private area, in which the owner has irrigated the area with treated wastewater from a stabilization ponds system for more than 20 years. Samples of soil and irrigation water were collected. The effluent results were analyzed by the physical-chemical parameters: pH, chloride, calcium, magnesium, electrical conductivity and sodium adsorption ratio. The soil was analyzed by the parameters: pH, calcium, magnesium and exchangeable sodium percentage. The effluent was classified, in general, according to the restriction degree on irrigation, from slight to moderate. Related to the soil, all physical-chemical properties presented an increase due to the irrigation with wastewater, but they did not reach critic values to the crops. Therefore, the long-term impact on soil because of irrigation with treated wastewater was not evident, as well as the effect of the irrigation water seems not to compromise the coconut crop