S-Metolachlor Volatilization from Plants within a Flux Chamber

Abstract

S-metolachlor volatile loss at 3, 6, and 12 h after spray application of Dual Magnum herbicide to cotton and soybean plants was measured in laboratory flux chambers. Data generated in these flux chambers were used to compute volatilization flux estimates. The emission rate of S-metolachlor ranged from 64 to 178 μg m −2 h −1 for soybean and 83 to 169 μg m −2 h −1 for cotton during the first 3 h sampling period after application. Flux rates decreased with increasing time, with the highest values observed in the 3 h period following application. Over the course of the experiment, cotton and soybean time-averaged flux means were not significantly different, indicating that differences in leaf surface characteristics did not impact S-metolachlor volatilization loss.

Persistence of S-metolachlor in the soil as affected by moisture content

“…S-metolachlor is a nonionic herbicide with residual activity in soil, controlling annual grasses and small-seeded broadleaf weeds and can be applied in preemergence (PRE), or early postemergence (EPOST) of tolerant crops (Szarka et al, 2022). Its mode of action is based on the inhibition of very-long-chain fatty acids, interrupting shoot development in susceptible plants (Hwang et al, 2023).…”