Revista Brasileira De Herbicidas 2001; 2(3): 149-154
Efficacy of burndown herbicides in Richardia brasiliensis control in no-tillage systems of common bean crop
DOI: 10.7824/rbh.v2i3.364
No-tillage systems, characterized by presence of straw on soil surface, provoke some alteration in weed population dynamics, such as a reduction in annual species and increase in perennial species, as well as the appearence of weeds that are hard to control , such as Richardia brasiliensis. The objective of the present work was to evaluate the efficiency of burndown herbicides in Richardia brasiliensis control and their effect on yield and yield components in beans grown under no-tillage systems. The experimental design was a complete randomized block with six treatments and four replications. The treatments were: sulfosate (878 g/ha), glyphosate SC (960 g/ha), sequential application of sulfosate and paraquat/diuron (627 and 200/100 g/ha), glyphosate WG (958 g/ha) and glyphosate+2,4-D (720+720 g/ha). The percentage of control in bean sowing, at 7 days after the sowing (DAS) and at 18 DAS were evaluated. The results at sowing were defficient, lower than 40% for ali treatments, while at 7 DAS was 72% for sulfosate and at 18 DAS there was no difference between sulfosate and glyphosate, with 80% and 75% of control, respectively. The best bean yields were with sulfosate and glyphosate, however there was no significant difference between them. Regarding yield components, the best results for average number of pods per plant was achieved with sulfosate and for the others components there was no difference between treatments.
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