摘要：This laboratory experiment was carried out to study the effect of soil samples drying on physical and chemical properties of vertic soils and their classification according to soil taxonomy. Usually, soil analysis is held on samples in air-dried condition. Clays of some soil types, however, have irreversible properties upon drying which can cause a bias in the measurement results and classification outputs of the soils. To study the irreversibility of clays upon drying, 25 samples of vertic soils were treated in moist and air-dried conditions prior to analysis. Statistical procedure of Match Pair Comparison was used to test the treatments effect. The results showed that the irreversibility of clay upon drying was reflected in the measured soil properties except for exchangeable-AI and -K, organic-C, and soil-CEC. Nevertheless, the intensity of the clay irreversibility of the vertic soils studied was low. Therefore, the drying treatment did not affect their classification outputs.
