Interferência do espaçamento e da densidade de semeadura de híbrido de milho para silagem sobre o desempenho agronômico

• Main Author: Klein, Gian Cezar
• Publication Date: 2023
• Format: Bachelor thesis
• Language: por
• Source: Repositório Institucional da UTFPR (da Universidade Tecnológica Federal do Paraná (RIUT))
• Download full: http://repositorio.utfpr.edu.br/jspui/handle/1/31806
• topic: Milho; Silagem; Grãos; Corn; Silage; Grain; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA

The corn crop is widely used in the production of silage, in view of its high yield of green mass, high nutritional quality as well as high nutritional value of silage. The present work aimed to evaluate different spacing and sowing densities of maize, aiming at the production of silage in the Southwest of Paraná. A randomized block design was used, with treatments in a 3x4 factorial scheme (three spacing and four densities). The evaluated spacings were: 45 cm, 90 cm and paired rows (composed by alternating rows with 45 and 90 cm), and sowing densities were 55, 65, 75 and 85 thousand plants ha-1. For the evaluation of the biometric measures, eight plants were randomly chosen in the central lines of each plot, where the height of the plants, height of insertion of spike and stem diameter were measured. The same plants were used to determine the yield components: number of rows/ear, number of grains/row, number of grains/ear and mass of 1000 grains. Forage production was determined on four other randomly chosen plants in each plot. No significant interaction was found between row spacing and plant density for the analyzed variables. The spacing used did not interfere with the yield variables, except for the ear insertion height and the number of corn kernels per row. The height of grains per ear was lower in the spacing of interspersed rows, compared to the others. The number of grains per row was higher in the 90 cm spacing, not statistically different from the intercalated spacing, which did not differ from the 45 cm spacing. Increasing plant density caused a linear increase in plant height and ear insertion height. Stem diameter decreased linearly with increasing plant density. The number of grains per row and the number of grains per ear did not change with the increase in plant density. The number of grains per row and the weight of a thousand grains increased linearly with the increase in plant density. The increase in plant population density led to greater forage production.