Abstract
The mechanical behavior of agricultural soils has to be understood to quantify and manage soil tilth. The development of theoretical soil mechanics has been limited to the failure of soil by shear, as applied to foundation structures in civil engineering. Recent soil failure studies in agricultural soils have shown that there are at least five different ways the soil will react depending upon soil type and applied stress conditions. Tine force prediction models, which are based upon passive earth pressure theory, have been reported to be inappropriate for agricultural soils. A survey of theoretical developments in agricultural soil mechanics suggests the need to develop new concepts to describe the response of agricultural soils to applied stresses.
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