Influência da velocidade na semeadura na cultura da soja

Abstract

Soybean cultivation is of great importance to the Brazilian economy, not only for economic purposes but also as an essential component of animal feed. The objective of this study was to evaluate the effect of planting quality in soybean cultivation using a planter equipped with a mechanical metering system at different travel speeds. The experiment was conducted at Fazenda Serra Dourada, located in the municipality of Dom Pedrito, state of Rio Grande do Sul, using a precision planter with a mechanical metering mechanism. A randomized block experimental design was used, with the source of variation consisting of seven travel speeds (4.5, 5.5, 6.5, 7.5, 8.5, 9.5, and 10.5 km/h-¹). The cultivar used was Neogen 610, which has a GMR of 6.1. Field variables evaluated included longitudinal distribution (missing, multiple, and acceptable spacings), while laboratory variables included first germination count and germination, emergence speed index (ESI), total length, shoot length, root length, fresh mass, and dry mass of seedlings. Under the conditions in which the study was conducted, there was an influence on the emergence speed index and germination for the different travel speeds evaluated. However, no significant differences were observed for the other variables analyzed.