Produtividade do milho com arranjo populacional em linhas gêmeas na segunda safra

Abstract

The productivity of corn crops depends on the cultivars, the environment, cultural management and their interactions. The population arrangement of plants in corn crops is a type of cultural management that can be an opportunity to increase grain productivity with the same operational costs. However, this population arrangement combined with the increase in plant population/ha can further increase grain productivity to an optimum. The combination of plant population arrangements can be beneficial when production factors such as water, light and nutrients are limiting. Thus, the objective of the project was to evaluate productivity in corn cultivation by arranging single and twin lines with different populations of plants in early and late sowing in the second harvest. The experiments were carried out in Western Paraná, sown in February and March, respectively favorable and unfavorable for high yields. The cultivar used was P3282VYH. The treatments were a combination of single and twin lines spaced 0.50 m and 0.50 m x 1 m with populations of 50, 55 and 60 thousand plants/ha. The experimental design used was randomized blocks in a factorial scheme. Each plot was composed of nine lines and was 5 meters long. The types of lines, populations and their interaction were significant. In the population of 60 thousand plants/ha, grain productivity was always higher in the twin lines. The single lines were better or equal to the twin lines for populations of 50 and 55 thousand plants/ha. In the twin lines, productivity increased linearly with plant populations for both sowings. In single lines, productivity decreased linearly with plant populations for sowing in February and was not significant for sowing in March. It is concluded that the arrangement of twin lines favors increased productivity in relation to single lines as the plant population increases; the arrangement of the twin lines with the increase in plant population favors increased productivity in favorable or unfavorable climatic conditions; The arrangement of single rows with an increase in plant population reduces or does not increase corn grain productivity in limiting climatic conditions.