Determinação de épocas de semeadura de cultivares de soja em solos de terras baixas da fronteira oeste

Abstract

The soybean crop (Glycine max L.) occupies an important part of the total area of land destined for crops in Rio Grande do Sul and thus confers great importance in the composition of regional economic dynamics. The objective of this work was to evaluate the yield and yield components of soybean cultivars with different groups of relative maturity at different sowing times in lowlands areas. The experiment was carried out at the Federal University of Pampa, in the city of Itaqui, Rio Grande do Sul, Brazil. It is composed of five soybean cultivars with different relative maturity (GMR): NS 4823 RR, BMX Elite IPRO, TMG 7062 IPRO, BMX ICON IPRO and TEC 7849 IPRO. The experimental design was randomized blocks with five subdivided plots and three replicates. The dates of sowing were 08/11/2017, 19/12/2017 and 18/01/2018. The highest productivity was obtained at the sowing date of 08/11/2017. The cultivars that presented best productivities were the BMX Icon IPRO and TMG 7062 IPRO, TEC 7849 IPRO and BMX Elite IPRO. For late sowing of the soybean cultivars tested, shortening of the development cycle with different GMRs is verified.