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Fig. 6. Scatterplot comparison of predicted and measured log-transformed air permeability, log(ka), for lysimeter soils and field soils (shallow and deep soil layers). Predictive models for ka as a function of air-filled porosity [ka(
)]: (a) ka = ka,100(/100)1+3/b (Eq. [14]); (b) ka = ka,100(/100)X–1 (Eq. [15]); and (c) ka = 700(21003 + 0.04100)(/100)X–1 (Eq. [15] with Eq. [12]); where ka,100 and 100 are the values at matric potential of –100 cm H2O. Calculated RMSE values by Eq. [2] using log(ka) data are given.
