Efluente de esgoto doméstico tratado e reutilizado como fonte hídrica alternativa para a produção de cana-de-açúcar

Abstract

With the excessive consumption of water in agricultural production, and the expansion of the cultivation of sugarcane due to growing demand for ethanol, in this context, a rational use of water for irrigation and use of wastewater in agricultural production has been raised. Therefore, the objective of this study was to evaluate the effects of reuse of treated domestic sewage effluent for irrigation of sugarcane. The study was conducted at the Research Center on Treatment and Reuse of Wastewater, in Aquiraz, CE. The experimental design was randomized blocks in split plots with four replications. In the plots were evaluated the effects of two types of water (well water and treated domestic sewage); in the subplots five irrigation water depths were allocated, based on percentage of evaporation in a Class “A” tank. It can be concluded that wastewater provided the highest potential yield of stem (272.1 Mg ha-1) and higher plant density (126,000 plants ha-1). The increase in irrigation water depths provided increase in potential yield and plant density, regardless of the type of water.