The interaction between rolling gear and soil is complex, but most important for the stress distribution in the soil profile. We explored the effect of three types of wide, low-inflation pressure tyres with similar dimensions on mean normal stress throughout the soil profile. We first tested the hypothesis that the stress is not affected by specific tyre-construction. Second, we tested the benefit of lowering the tyre inflation pressure to a minimum for the tyre with the lowest recommended inflation pressure. Finally, we tested the effect of tyres with similar tractive potential at different wheel loads, i.e. with a different weight-pull ratio. Stress measurements were made with Bolling probes at six positions simultaneously: both beneath the centreline (centre) and at 0.3 m lateral distance (+0.3 m) of the centreline of the wheel track, at 0.2, 0.4, and 0.6 m depth. The results revealed a very limited effect of tyre construction on mean normal stress. No differences were measured beneath the centre, and the differences at +0.3 m were found only at 0.2 m depth for the tyres at the rear axle. The effect of minimising tyre inflation pressure was limited to the upper parts of the soil profile for the measurements beneath the centre of the tyre (significant at 0.2 m depth and a trend at 0.4 m depth). Finally, our study did not reveal significant benefit of tyres with a lower wheel load while potentially having similar tractive performance, although the reduction of wheel load and associated lower inflation pressure potentially reduce stress in both top- and subsoil. The results emphasize that in order to reduce soil stress, tyre design and use should allow for a large contact area and low inflation pressure.

滚动齿轮与土壤之间的相互作用很复杂，但对于土壤剖面中的应力分布而言最重要。我们探索了三种尺寸相似的宽型低充气压力轮胎对整个土壤剖面中平均法向应力的影响。我们首先检验了压力不受特定轮胎构造影响的假设。其次，我们测试了将建议的最低充气压力的轮胎的充气压力降低到最低的好处。最后，我们测试了在不同的车轮负载（即，不同的重量-牵引比）下具有类似牵引力的轮胎的效果。使用Bolling探针同时在六个位置进行应力测量：在中心线（中心）下方和轮距中心线的0.3 m横向距离（+0.3 m）处（0.2、0）。4，深度为0.6 m。结果表明，轮胎构造对平均法向应力的影响非常有限。在中心下方未测量到任何差异，并且后轴轮胎在0.2 m深度处仅发现+0.3 m处的差异。最小化轮胎充气压力的作用仅限于土壤轮廓的上部，以便在轮胎中心以下进行测量（在0.2 m深度处明显，在0.4 m深度处趋势）。最后，我们的研究并未显示出轮胎负荷较低时轮胎具有显着的牵引性能的显着优势，尽管降低轮胎负荷和相关的较低的充气压力可能会降低顶土和底土中的应力。结果强调，为了减少土壤压力，