Componentes de rendimento e produtividade de cultivares de soja em diferentes épocas de semeadura

Abstract

The cultivation of soybeans (Glycine max) currently occupies a significant area in Rio Grande do Sul, about 6.3 million hectares. This intensification in cultivation makes more research necessary about the adaptability and sowing season of the various cultivars found on the market. The objective of this work is to evaluate the productivity and yield components of soybean cultivars with different relative maturity groups, at different sowing times in lowland areas. The experiment was conducted at the Universidade Federal do Pampa, in the city of Itaqui, Rio Grande do Sul. This experiment was composed of five soybean cultivars with different relative maturity groups (GMR), which were C2531 E (5.3), DM 5958 IPRO (5.8), BS 2606 IPRO (6), BMX GARRA IPRO (6.3) and DM 66i68 IPRO (6.6). The three sowing seasons were 10/27/2021 and 11/18/2021 and 12/10/2021. The following were considered: number of nodes in the primary rush, number of nodes in the secondary rush, number of waves in the secondary rush, number of waves in the secondary rush, number of grains per pod in the primary rush, number of grains per pod in the secondary rush, duration of cycle stages, and yield. Late sowings reduced the cycle and productivity. The highest productivity was manifested at sowing day October 27, 2021 by the cultivars DM 66i68 IPRO, BMX GARRA IPRO and BS 2606 IPRO.