Wind and water erosion are not the only means by which soil can be moved beyond the boundaries of a field. Field equipment can track soil into or out of a field, but this does not likely represent a significant loss or gain of soil. Soil removed from the field with the harvested crop can be considerable for root crops such as potatoes, sugar beets, and carrots. Soil losses of 3.2Mgha yr with the harvesting of potatoes have been reported (Table 5). The amount of soil loss is related to the soil texture and moisture content as well as the method of harvesting.
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