Comparativo entre a aplicação de nitrogênio e de composto orgânico em diferentes fases vegetativas na cultura do milho

Abstract

Currently, maize (Zea mays L.) is one of the main cereals grown around the world, being of high nutritional value for human food, animal and it also serves as raw material for the food industry. Nitrogen is a macronutrient essential for the plant metabolism, participating directly in the biosynthesis of proteins and chlorophyll. The application of organic compound throughout the development of the crop promotes improvements in soil fertility, ensuring high yields. The objective of this study was to verify the productive responses of the maize crop, through the application of nitrogen - based inputs in different forms (conventional chemical fertilization and organic fertilization) in different phenological phases (V2, V4, V6). obtaining the best fertilization and the best phenological stage for the practice. The experiment was carried out in 32 plots of 3.15x5m (15.75m²), consisting of 7 rows in the line spacing of 0.45m x 0,33m (3 wk / m), with 4 replicates for each treatment and the means compared by the Scott Knott test at 5% significance. As a result the nitrogen fertilization in the cover once submitted in the conventional chemical formula presented superior results in comparison to the fertilization in cover in the organic form. The control group presented lower results than those previously mentioned; proving that nitrogen fertilization independently of the application season presents a satisfactory productive response to increased productivity in the maize crop.