Abstract

The objective of the present work was to determine the mobility of flumioxazin in Argisol, as a function of two pluviometric indices, as well as possible influences of the chemical and physical properties, on the action of the herbicide. 32 PVC tubes were used (10 cm in diameter by 50 cm in height). These containers were completely filled with the Argisol collected in the arable layer of an area where there was no herbicide application. Once the flumioxazin (50 g i.a. in 200 L/ha) was applied, the treatments were applied. Then, rainfall of 10 mm per day was simulated to reach the desired levels of rainfall (40 and 80 mm), so that the tubes were dismantled and 5 sorghum seeds (Sorghum bicolor) were seeded each depth (2.5; 5; 10; 15 and 30 cm) in the profile of the tubes. These were maintained for 15 days under field conditions to carry out the initial evaluation. Height, dry matter, and phytointoxication were evaluated to analyze possible changes that could be characterized as herbicide effects. Under experimental conditions, flumioxazin was sparingly mobile, remaining in the superficial layer (2.5 cm).

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