Desempenho agronômico do niger (Guizotia abyssinica) em função das diferentes doses de nitrogênio e enxofre por cobertura

Abstract

Today Brazil is one of the largest grain producers in the world. In order to reach this mark, a greater investment in the nutritional part is one of the main factors for the development of crop production, thus increasing yields. The objective of the work was evaluated in an application of elemental and nitrogen oxides in the production components of niger and in the quality of the genera. The research was developed in the agricultural year of 2016, at the Experimental Farm of Agricultural Sciences of the Federal University of Grande Dourados (FAECA) located in the city of Dourados, MS. The experiment was carried out in a randomized complete block design with treatments arranged in a factorial scheme (5x4), consisting of five doses of sulfur (0, 30, 60, 90, 120 kg ha-1) and four doses of nitrogen (0,60, 90, 120 kg ha-1), with four replicates. The plots consisted of eight lines, spaced 0,45 m apart with 5 m length, totaling 18 m2 each. The evaluated characteristics were: height, number of branches and chapters per plant, shoot dry mass, thousand grain mass, productivity, nitrogen and leaf sulfur content, nitrogen, sulfur and protein content in the grains. The data obtained were submitted to analysis of variance and when the effects of the treatments were significant at 5%, by the F test, the influence of N and / or S doses was evaluated by regression analysis. In relation to nitrogen x sulfur interactions, there was a significant effect for dry mass, plant height, chapter number and nitrogen in the leaf. Occurring difference means in isolated doses of nitrogen only for the analyzes made, to determine the leaf nitrogen. For isolated doses of sulfur, a significant difference occurred at 5% probability for a mass of 1000 grains and at 1% probability for leaf nitrogen.