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Rice production is highly affected by weed competition. The efficacy of chemical weed control and crop safety is a function of absorption, translocation and metabolism of herbicides. This study investigates the effect of cold stress 22/16 °C (day/night) on absorption, translocation and metabolism of ¹⁴C‐bispyribac‐sodium on rice seedlings.

Maximum ¹⁴C‐bispyribac‐sodium absorption occurred at 24 h after herbicide treatment and was stimulated by the warm 30/22 °C (day/night) temperature. A large amount of total absorbed herbicide was retained in the treated leaf, indicating that bispyribac‐sodium had minimal translocation to other plant parts. Piperonyl‐butoxide (a P450 inhibitor) plus herbicide caused greater injury than the herbicide alone. In addition, injury on rice plants was enhanced by exposure to cold, emphasizing the negative effect on herbicide metabolism. In the thin‐layer …