Densidade de plantas e posicionamento de sementes na cultura do milho

Abstract

The maize crop is the most developed in terms of productivity per area in Brazil in recent years. This is due to the development of new technologies and techniques of sowing and management, which aim to improve the production gains of the crop, seeking to meet the growing demand of the grain with the population increase. This work consists in evaluating the productivity, the insertion of the 1st ear, the diameter of the stem and the mass of a thousand grains of corn, submitted to different sowing forms and different plant populations. The work was developed during the agricultural year of 2016/2017 in the experimental area of the Federal Frontier University in Cerro Largo City, in a typical dystroferric Red Latosol soil. The experiment was carried out in a randomized complete block design with 8 treatments and 4 replicates, in a total of 32 plots. The treatments are formed by combining mechanical sowing and sowing with manual positioning. For both sowing forms, four populations were used: 50, 70, 90 and 110 thousand plants ha 1 . The data were analyzed by the statistical program sisvar, which compared all variables and sowing forms through the Scott-Knott test at 5% significance. It is concluded that the mass of one thousand grains and the diameter of the stem decreases with a population increase for the evaluated treatments. The position of sowing position showed higher values in relation to mechanical sowing in the population of 70 thousand plants per ha-1 for the stem diameter variable. However for the variables yield per area, productivity per plant number and main ear insertion, there was no significant difference between the treatments analyzed.