The relation between soil water retention and particle size distribution parameters for some predominantly sandy Western Australian soils

摘要: The soil water retention curve (WRC) may be estimated from texture if there is shape similarity between the normalised cumulative particle mass size distribution (PSD) and WRC. For similar shaped curves, parameters describing of PSD also describe corresponding We studied relation PSDs WRCs at 4 sites in Western Australia with predominantly sandy soils fitted a sigmoidal function to all WRCs. model gave an excellent description WRC data sets. parameter slope was correlated PSD. However, asymptotic minima differed leading poor estimates residual contents, θr. This difference most marked 2 clay subsoils resulted progressively greater errors prediction content increasing negative pressure head.