Interference of the Association Oxyfluorfen + Flumioxazin and the Addition of Mineral Oil on a Phytosociological Survey

Abstract

Phytosociological studies are extremely important for the management of weeds in cultivated areas. Thus, the goal of this work was to evaluate the interference of mineral oil associated with oxyfluorfen and flumioxazin, through the phytosociological survey of weeds. Therefore, this experiment was conducted in a 2 x 5 + 1 factorial design and with four replications; the following oxyfluorfen + flumioxazin associations were evaluated: 240 + 50, 192 + 40, 144 + 30, 96 + 20 and 48 + 10 g a.i. ha-1, with and without the addition of mineral oil, including a control sample without application. Thirty days after the application, plant density, frequency and abundance of species were determined, and so were frequency, density and relative abundance, as well as the importance value index. Results indicate that the application of the mixture oxyfluorfen + flumioxazin, regardless of the addition of the mineral oil, provided a great population of Poaceae. The species Digitaria horizontalis and Brachiaria decumbens showed a higher importance value index in all treatments. Families with greater representation as for number of species were Poaceae, Asteraceae, Fabaceae and Rubiaceae. The addition of oil and different doses of the mixture oxyfluorfen + flumioxazin did not affect the population of weeds, compared to the mixture without mineral oil.

Transport of Atrazine Via Leaching in Agricultural Soil with Mineral Oil Addition

“…Adjuvants help expressing your herbicides activity and effectiveness of control, being dependent on their physicalchemical properties. Silva and Weda (1986) found that atrazine mixture with soybean oil in early post-emergence showed greater efficiency in the control of alexandergrass (Urochloa plantaginea) when used in isolation, but Mendes et al (2018) reported that the addition of oil in mixture oxyfluorfen + flumioxazin had not interfered on weed population in comparison with the mixture without mineral oil.…”