Abstract: Background: The effects of applying herbicides in a mixture with foliar fertilizers on soybeans are extremely important for successful production. Objective: To evaluate the effect of glyphosate formulations applied in mixture with sulphate fertilizers on the soybean crop. Methods: The experiment was conducted in a randomized block design with four replications. The treatments were arranged in a 4 × 3 factorial scheme, with three glyphosate formulations: Roundup WG, Roundup Ultra and Glizmax, plus a weeded control. The second factor […]

Abstract: Background: Glyphosate is the most widely used herbicide in Brazilian agriculture, and management techniques that increase its efficacy are important tools for the production system. Objective: Evaluate the effect of adding the nitrogen adjuvant ammonium sulfate [(NH4)2 SO4] to glyphosate on the control of Urochloa brizantha BRS Piatã and establish the best [(NH4)2 SO4] dose to mix with the herbicide. Methods: Two greenhouse experiments were conducted. In the first, six glyphosate doses (0; 33.75; 67.5; 135; 270; 540 g […]

Abstract Background Weed interference in crops causesproblems that reflect in several losses. Several control methods are available, among them, chemicals are commonly used. Objective Our objective was to evaluate the effectiveness of different herbicides used alone and in combinations in the control of horsetail grass ( Andropogon bicornis ) at different phenological stages. Methods The experiment was carried out in an area with natural infestation of A. bicornis in the municipality of São Miguel das Missões, in Rio Grande do […]

Abstract Blackground The species Maranta sobolifera L. Andersson (Caeté) is tolerant to chemical management and its dispersion in the agricultural areas of western Paraná has increased every year. Objective Evaluate the control of M. sobolifera using different doses of herbicides applied alone and in mixture in pot and field experiments. Methods In the pot experiment, isolated applications of glyphosate (2160 g ha-1), carfentrazone (60 g ha-1), and 2,4-D (670 and 1340 g ha-1), as well as mixtures of [fluroxypyr + […]

Abstract Background Soybean is one of the most important crops planted in Brazil. The management of weeds becomes necessary, in this case the horseweed (Conyza spp.), because the lack of control is responsible for a significant reduction in production. No-tillage in the main straw system used in soybean crops and with the prohibition of the herbicide paraquat, used in the pre-planting of the crop in Rio Grande do Sul, efficient alternatives to this management were evaluated. Objective The objective of […]

Abstract Background The selection of bioindicator plants can help in the determination of herbicide residues in the soil. Objective To analyze the levels of injuries and biomass reduction in bioindicator plants in the presence of S-metolachlor residue in the soil. Methods Four potential bioindicator species were evaluated: cucumber (Cucumis sativus), radish (Raphanus sativus), sorghum (Sorghum bicolor) and zucchini (Cucurbita pepo), in six doses of S-metolachlor (0, 180.5, 360, 720, 1440, and 2880 g ha-1). The plants were evaluated, 21 days […]