Introducing loads onto the soil via pneumatic tyred equipment is the major cause ofcompaction of agricultural soils, which causes damage to the soil-water-air-plant system. Thedegree of soil compaction is largely influenced by the loads applied to the soil and resultingsurface and subsurface pressure. Therefore, this study was conducted in order to determine aneffective method to measure the pressure distribution under a selection of pneumaticagricultural tyres on a hard surface and in the soil profile. As a result of this, it has beenpossible to evaluate the influence of tyre inflation pressure, load, ply rating and tread patternon the resulting pressure. Also, the carcass stiffness of the tyres studied was determined andalternative methods to predict the carcass stiffness were evaluated and an improved techniquewas developed. Cont/d.
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