Efeito do nitrato, amônio e luz na assimilação do nitrogênio em plantas de milho

Abstract

Among the factors that affect corn productivity in Brazil is the delay at harvest, low plant population, lack of technology and inputs. As a preponderant factor responsible for the low productivity rates, the lack of fertilization programs stands out, as well as physical-chemical impediments that occur in the soils of Rio Grande do Sul, which do not allow full root development. In addition, other factors that are difficult to control can be minimized using meteorological information and agricultural zoning, providing greater security for investment in the crop. A relevant point is the availability of nutrients for the amounts extracted by corn. If these needs are met, the basis for achieving high productivity is already in place (Teixeira, 2004). To reach high levels of productivity, the dose of nitrogen (N) applied and the time of application define the success of nitrogen fertilization. Nitrogen assimilation is a vital process that controls plant growth and development and has marked effects on phytomass and final crop productivity, and is present in various forms in the biosphere.