Fig. 2 (a) The relative resident concentrations obtained from TDR are plotted as ln(1 - C/C_o) vs. t*, and the regression lines are fitted to the data using Eq. [3]. (b) The resident concentrations are plotted as ln(1 - C/C_o) vs. t*, and the regression lines are fitted to the data using Eq. [3]. The data are obtained from surface 2-cm soil extracts sampled after applying a series of three different fluorobenzoate tracers

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