Produtividade da cultura do sorgo forrageiro sob diferentes regimes de irrigação superficial em vasos com reúso de efluente da suinocultura

Abstract

Water is a finite natural resource and fundamental for the survival of living beings. In agriculture, irrigation is important so that agricultural crops can be made available the necessary amount of water for their proper development, in order to supply their water demand and the population demand for food. Knowing this, the efficient and rational use of water resources are fundamental for the conservation of the environment. The objective of this work was to analyze the dry mass (DM) yield of sorghum bicolor (Sorghum bicolor (L.) Moench) under different irrigation and fertilization regimes, using swine effluent, sown on soil cover with dried oats. A grazing simulation was performed through a cut of the leaf area at approximately 50 days. The experiment was conducted in the greenhouse of the Federal University of Pampa - Alegrete Campus. The culture was submitted to four different irrigation treatments where its irrigation depth was calculated by reading the class "A" tank and its formulations to determine reference evapotranspiration (ETo) and crop evapotranspiration (ETc). The treatments were: 1 - Water from the artesian well (Witness); 2 - Swine Effluent; 3 - Double the treatment 2; And 4 - The quadruple of the treatment 2. The experimental data presented discrepancy, with that, was applied test of normality and descriptive statistics. As the data are not normal, it can not be performed in an anova, leading to the use of the Mann-Whitney Test or "U" Test at the 5% probability level for data analysis. The use of water in the artesian well and different slides of irrigation with swine effluent did not present significant difference between the results. And the temperature inside the greenhouse and use of the desiccant in previous pasture for the production of dry mass and protection of the soil to receive the sorghum forage may have had a negative influence on the dry mass yield.