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The frequent use of associations among postemergence herbicides has raised many questions about the selectivity of these for soybean crop. The objective of this work was to evaluate the selectivity of postemergence herbicide associations, and their influence on agronomic aspects, and yield of Msoy 6101® , a soybean cultivar with early cycle. The study was conducted in Motevidiu - GO, during the 2004-2005 crop season. The experimental block design was entirely randomized in split-plot scheme with twofold checks, and four replicates. Tested treatments consisted of : flumiclorac – pentil + chlorimuron ethyl (40 + 12,5 g ha-1), lactofen + chlorimuron ethyl (96 + 12,5 g ha-1), chlorimuron ethyl + Imazethapyr (60 + 12,5 g ha-1), flumiclorac - pentil + chlorimuron ethyl + clethodim (40 + 12,5 + 60 g ha-1), and Lactofen + chlorimuron ethyl + haloxyfop methyl (96 + 12,5 + 42 g ha-1). Results showed that the mixture lactofen + chlorimuron methyl + haloxyfop methyl caused the highest levels of phytotoxicity, reducing plant height. No herbicide association reduced the number of pods per plant. However, the mixture flumiclorac-pentil + chlorimuron-ethyl + clethodin caused significant reduction on yield, and cycle of the early soybean cultivar Msoy 6101® .

Seletividade de associações herbicidas pós-emergentes em variedade de soja precoce