Aplicação do Modelo de Arya-Paris para estimar a curva de retenção de água em solos do Estado Bahia

Abstract

Soil water retention curve (SWRC) is an important soil attribute because it's a soil quality indicator and is fundamnetal to study the water dynamic in soil-plnar-atmosphere system. Conventional SWRC determination is laborious and time-consuming, preventing the processing of many sets of samples. This has led to its estimation using pedotranfer functions. With this study aimed to apply Arya-Paris model to SWRC estimate for soils os Bahia Stat, Brazil, based on soil particle size anlysis, compared with SWRC determined. Samples were collected from horizons A and AB, and, or B and, or C, for total os 26 soils and 63 horizons. Particle size nalysis was determined by automatic soil particleanalyzer based on y-ray attenuation and traditional Bouyoucos hydrometer method. Arya-Paris model showed better SWRC predictions for clayey soils, follwed by sandy, medium and very clayey soils. Good model performance was observed for all soils togethe. The A1 saling factor provided better predictions, followed by a3, with a2 showed unsatisfactory behavior. Bouyoucos hydrometer method gave slightly higher predictions than automatic soil particle size analyzer.