Evaluation of Pedotransfer Functions for Estimating Soil Water Retention Curve of Ap Horizon Soils for Various Soil Series of Reclaimed Tidal Flat Soil

This investigation was to evaluate the applicability and prediction accuracy of pedotransfer function (PTF) estimate water retention curves Ap horizon soils for five soil series which cannot be directly used cultivate upland crops other than rice because their high salinity. Soil (SWRCs) were obtained from 150 undisturbed samples collected horizons textures grouped into sandy loam with contents sand (>60%) low clay (<10%) silt relatively content (<10%). Soil-water characteristics between 0 −50 kPa −1500 measured using sandbox, kaolin-plate, pressure chamber methods, respectively. The SWRCs also estimated by Rawls Brakensiek PTF (RB-PTF). compared against those RB-PTF. modeled data closely fit although saturated volume (θs) residual (θr) RB-PTF higher mean both textures. air entry point (α) steepness water-retention curve (n) in loam. SWRCS yielded best all series, whereas MBE values less zero indicate that θv at potentials is under-predicted. r2 greater 0.9 represent are suitable predicting RTFS points do not vary around regression line.