Abstract
The draft force on a tillage tool is dependent on the soil strength. The relationship between soil strength and the soil's density and moisture content would be useful in determining the draft forces generated during a tillage operation. Torsional shear tests were performed on a Ruston loamy sand to investigate the relationship between the soil strength parameters (soil cohesion and friction angle) and soil properties (soil density and moisture content). These soil strength-properties relationships are discussed. The effect of linearizing the Mohr failure envelope at different normal pressures is investigated. Multiple linear regression equations were developed, defining the soil strength-properties relationships for this soil type. The resulting R-square values ranged from 0.89 to 0.96.
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