Pedotransfer Functions for the Hydraulic Properties of Layered Soils
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In this study, the pedotransfer functions for the vertical saturated hydraulic conductivity, water contents at the suctions of 0- (saturation), 60- (drainable porosity), 100-, 330- (field capacity), 1000-, and 15000-cm (permanent wilting point) were developed using easily measurable soil physical and chemical properties obtained from 34 horizons of nine profiles from a lake origin of Northwest Ohio plain. For this analysis, the multiple-linear regression analysis by stepwise method was employed. The accuracy of these functions were evaluated using the measured vertical saturated hydraulic conductivity and water contents at the field capacity and wilting points from the soils of 19 horizons of five profiles of an alluvial Yeşilırmak River valley close to the downtown of Tokat city. The results of evaluation showed that the developed pedotransfer functions for the vertical saturated hydraulic conductivity and field capacity produced under and over predictions, respectively. The developed pedotransfer functions for the wilting point yielded fair results.