Weed Competition on Soybean Varieties from Different Relative Maturity Groups

One factor limiting the achievement of high yields in soybean crop is weed interference. The level interference can vary according to specificities community but also due agronomic characteristics varieties. objective this work was evaluate effects on varieties different relative maturity groups (RMG). A field experiment implemented a randomized complete block design, 3 × 4 factorial scheme, with five replications. treatments were composed BMX Flecha® (RMG 6.6), Power® 7.3), and Bônus® 7.9), associated following four managements: weeding throughout cycle; weeded up 20 days after emergence (DAE); DAE until end not entire cycle. There no interaction between management for speed index, plant height, chlorophyll, first pod height insertion, population, thousand-grain weight yield. initial caused changes composition community. managements cycle provided higher levels chlorophyll grain without during negatively influenced yield components. Late interventions control, regardless variety, result losses.