Adjusting the water retention curve for retractable soils

The soil water retention curve (SWRC) relates moisture to energy (matrix potential). calculation of the volumetrichumidity considers sample volume. In retractable soils, this volume varies according drying or wetting soil, which can result in errors calculated moisture. objective study is quantify variation soils and elaborate SWRC via traditional method, does not consider retraction, a second called adjusted, that thephenomenon retraction. Soil samples have been collected horizons A B from six profiles Thus, for it isrecommended adjustment be carried out considering actual (retracted), each matrix potential applied. This reduces errors, mainly determining permanent wilt point available water.