Avaliação do cultivo do girassol na Fronteira Oeste do Rio Grande Do Sul fertirrigado com águas residuárias

Abstract

The search for rational options that allow for the reuse of wastewater has become more necessary every day, both from the environmental point of view and from the economic point of view, especially in regions where water resources are insufficient. The present research aims to evaluate the feasibility of the use of wastewater in the development of the sunflower crop, to evaluate which irrigation management approach in this research will be more efficient and also to evaluate the pH, salinity, dissolved oxygen, electrical conductivity and temperature of the analyzed effluents. The research was conducted in the experimental area of the Agricultural Engineering course at the Federal University of Pampa - Alegrete Campus. The experimental design adopted was completely randomized with three treatments and ten replicates for the Class A tank and the Penman-Monteith method, the T1 treatment was designated as control with water from artesian well, T2 with domestic effluent and T3 effluent from swine. During the research the parameters of water quality were evaluated: electrical conductivity, pH, temperature salinity and dissolved oxygen. Through the software Assistat the statistical analysis was done comparing the control treatment with domestic effluent and control with swine effluent in relation to the development variables. There was no significant difference between the two effluent treatments adopted, denoting the efficacy of both for the production and development of the sunflower on the western border of Rio Grande do Sul. Among the irrigation management methods discussed in this study both were effective for the culture Of the sunflower, among the parameters of water quality the swine effluent was the one that obtained greater prominence to hold high values of electrical conductivity, salinity and temperature, however for the cultivar analyzed such values were not an obstacle for its development.