THE DETERMINATION OF SOIL-WATER DESORPTION CURVES FOR SOIL CORES

摘要: An improved technique for measuring soil water desorption curves of a large number cores was tested. A procedure improving contact between the and "tension medium" resulted in rapid extraction from 7.6 × 7.6-cm at pressure heads 0 to −500 cm water. The data clay sandy loam showed that equilibrium reached less than 200 h all heads. medium," used essentially as porous plate, carefully chosen with narrow pore size distribution. This provided high hydraulic conductivity air-entry values, both necessary efficient over head range tensiometer-pressure transducer combination establishing equilibration time proved more reliable traditional weight-loss criterion. consistency reproducibility demonstrated using hysteretic loops well standard deviations contents each on...