Fig. 1 A diagram of the soil sampling scheme beneath the tension infiltrometer. The soil sampled immediately after the tracer application was used to estimate _im and with the Jaynes et al. (1995) method, and to estimate _im with the Clothier et al. (1992) method. All sampling dates were used to estimate with the Clothier et al. (1995) method. The sampling dates immediately after the final tracer application, 0, 2, 7, and 15 d, correspond to the numerals, 0, 2, 7, and 15 within the white circles, respectively