Gypsum and texture effects on the estimation of saturated paste electrical conductivity by two extraction methods.

摘要

Texture and salt type can influence the relationships between saturated paste electrical conductivity (ECe) and EC of other soil/water ratios. The objectives of this study were to develop and validate relationships among ECe, EC1:2, and EC1:5 for soils in Yazd Province, Iran, and evaluate the effects of texture and gypsum on those relationships. Two hundred thirty-six soil samples were collected, 200 of which were used to develop and 36 were used to validate the models. The soils were divided into two textural categories, coarse and fine, and two categories, with and without gypsum. The 1:2 procedure predicted ECe of slightly more than 1:5. Gypsum content had stronger impact on the accuracy of models in predicting ECe than texture. The ECe=4.0723EC1:2-5.7135 and ECe=3.5142EC1:2+0.7615 models are recommended for soil with and without gypsum, respectively. The methodology can be implemented in any other region, particularly if gypsum is present..