Fig. 1. Soil textural triangle according to the Soil Survey Division Staff (1993), showing the range of soils studied. Three groups of selected soils are distinguished based on variations in the content of two soil separates while keeping the third one approximately constant. Soils in Group 1 () vary along the silt and sand axis. Soils in Group 2 () vary along the clay and sand axis. Soils in Group 3 (•) vary along the silt and clay axis. Open squares represent all other soils in the database.

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