Fertilizantes nitrogenados com diferentes fontes de polímeros na cultura do arroz

Abstract

Rice (Oryza sativa L.) is the most important food for food security for the world population (food energy). For an adequate productivity of any crop, a correct fertilization, especially the ones with nitrogen, assumes a fundamental role, with special emphasis on its coating with polymers of organic derivatives. The aim of this study was to evaluate the behavior of rice in the laboratory (germination and vigor tests) and under greenhouse conditions (development and productivity) as a function of simple nitrogenous, coated/pelleted fertilizers commercial and non-commercial (cellulosic derivatives polymers developed at UFU, Pontal Campus). A randomized block experimental design, in a 5 x 5 meters factorial scheme, was used, involving five nitrogenous products (S - urea, P - urea with commercial polymer, M - urea with commercial micros, I - urea with commercial methyl cellulose and T - urea with methyl cellulose from organic material) and six initial doses (0%; 0.02%; 0.03%; 0.04%; 0.05%; 0.06% nitrogen), with four replications. In the greenhouse, doses with 50% and 100% of the recommendation were used for the cultivation of the five types of products, in the final stage of the culture were evaluated these points: average plant height, fresh and dry mass of useful plants and profiles, grain yield, grain yield per panicle and grain moisture content. The results obtained were put through analysis of variances and the mean comparison test was applied. The vigor and germination of rice seeds are influenced by the doses of simple nitrogen products, coated on the market and other non-commercial products with cellulosic derivatives. Biomass production and grain yield are influenced by doses and simple nitrogen products, coated on the market and other non-commercial products with cellulosic derivatives.