Research Article
Identification and Mechanism of Echinochloa crus-galli Resistance to Fenoxaprop-p-ethyl with respect to Physiological and Anatomical Differences
Table 1
Effect of fenoxaprop-p-ethyl on the susceptible and resistant biotypes of E. crus-galli expressed as the rates of the herbicide required for 50% reduction of the aboveground biomass (GR50) and estimated resistance ratio.
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c: the mean response (fresh weight as percent of control) at very high herbicide rate. d: the mean response (fresh weight as percent of control) at zero herbicide rate. b: slope of the line. GR50: herbicide rate to reduce plant growth by 50% relative to untreated control. R2: the coefficient of determination. R/S ratio: the GR50 of the resistant biotype divided by the GR50 of the susceptible biotype. value: the probability of the obtained results. |