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Leaf slices of the sethoxydim sensitive grasses Poa pratensis and Festuca ovina and the sethoxy- dim resistant grasses Poa annua and Festuca rubra take up the herbicide at similar rates. Uptake is almost linear with concentration up to 2 mᴍ, independent of light and little affected by tempera­ture between 0 and 25 °C. Uptake is highly pH sensitive. At pH 7.0 rates of uptake are only about 20% of the rates observed at pH 3.5. Time course of uptake suggests a rapid equilibration of the compartments taking up the herbicide within 2 h. It is suggested that sethoxydim uptake by the grass-leaf tissue is a nonspecific process involving passive lipid diffusion and lipid equilibration of the non-dissociated weak acid sethoxydim (pK a  = 4.6).

Sethoxydim-Uptake by Leaf Slices of Sethoxydim Resistant and Sensitive Grasses