Rice performance following exposure to sub-lethal concentrations of paraquat at multiple growth stages
Year: 2026
Type: article
Abstract: Rice is often planted in the mid-southern United States around the same time that paraquat is applied either preplant or preemergence herbicide to other row crops in adjacent fields. Additionally, off-target movement of paraquat may occur onto rice late in the season due to paraquat’s use as an aid in soybean harvest. Although previous research has documented rice response to early season and late-season exposure to sublethal concentrations of paraquat, research quantifying rice injury after multiple exposures is not available. Therefore, research was conducted from 2019 to 2021 in Mississippi with the aim of evaluating rice growth and yield after exposure to sublethal concentrations of paraquat multiple times during the rice life cycle. Paraquat (84 g ai ha −1 ) was applied to rice at the spiking to 1-leaf (VEPOST) and 3- to 4-leaf (MPOST) growth stages to simulate early season exposure, while late-season exposure of paraquat was simulated with applications to rice at a rate of 28 g ai ha −1 when 50% of plants in a plot had visible panicles (HEAD) to the day of draining (DRAIN), and a sequential treatment with rice exposure at HEAD followed by DRAIN. Rice injury was greatest pooled across early season exposure, when paraquat exposure occurred at HEAD followed by DRAIN. Rough rice grain yield was reduced by 15% and 18% from HEAD and HEAD followed by DRAIN exposures, respectively, compared with the no-late-season exposure. Whole milled rice yields were not affected by multiple exposures to paraquat. Multiple exposures to paraquat had the greatest effect on rice performance when the exposure occurred both early and late in the season.
Source: Weed Technology
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: gold
Estimated APC paid: $3,550
OpenAlex ID: W7170183343
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