Massive tractors and combine harvesters could be having a lasting impact on soil, a study suggests.
The researchers think the growing weight of farm machinery poses a threat to agricultural productivity.
Thomas Keller, professor of soil management at the Swedish University of Agricultural Sciences in Uppsala, Sweden, says machinery should be designed not to exceed a certain load. However, the heft of modern harvesters is outweighed by long-necked plant-eating dinosaurs such as brontosaurus, which once roamed the Earth.
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