Mobility of flumioxazin herbicide in a Dystrophic Red Yellow Latosol at Brazilian Southern Amazon

Abstract

Herbicides are chemicals which can contaminate soil and water, if inadvertently used. In the soil, the herbicide may undergo adsorption and leaching or degradation by physical, chemical and biological processes in addition to being absorbed by the weeds and / or cultivation. The aim of this study was to determine the mobility of flumioxazin in Dystrophic Red Yellow Latosol, in the southern Amazon, using sorghum plant as test under different rainfall indexes. We used PVC pipes, which were filled with soil. The experimental design was completely randomized in a 2x2x5 factorial scheme, consisting of herbicide treatments [with or without flumioxazin (50 g i.a. ha-1)], rain (40 or 80 mm) and soil depths (2.5, 5, 10, 15 and 30 cm). After each rainfall simulation, the tubes were removed and sorghum seeds were placed in the depths 2.5, 5, 10, 15 and 30 cm from the top of the columns. It was observed a higher activity of flumioxazin in the initial 2.5 cm. In all depths where herbicide effect was observed, it was also observed the interruption of sorghum growth, being more intense in the simulations of 80 mm of rainfall. The herbicide presented high adsorptive capacity in Dystrophic Red Yellow Latosol, with mobility up to the first 2.5 cm along the profile.

Sustainable Control of Galinsoga parviflora with Oxyfluorfen, Flumioxazin, and Linuron Application in Two Soils Cultivated with Garlic

“…Both soil types have a high clay and OM content, which makes it easier for the seeds to remain in the topsoil layer and come into contact with the herbicides. In addition, the mobility and leaching capacity of all these products are low in clayey soils [30,39,40]. This factor contributes to the control of the seed bank of G. parviflora.…”