Abstract
The weight of agricultural machines is steadily increasing, and this leads to higher axle load and deeper subsoil compaction. As an international joint effort, the effects of high axle load traffic on subsoil compaction and crop yield are being studied in 26 field experiments in Europe and North America. Results at present available, applicable to humid areas with annual freezing, show that crop yield losses normally become larger and more persistent with increasing soil clay content. The results indicate that restrictions upon axle loads are required.
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