Table 3.

Average global and U.S. cropland erosion rates reported in previous studies

Source	Mean erosion rate, mm/yr
Global cropland
Wilkinson (49)	0.64
U.S. cropland
Barlowe (56)	1.00
USDA (57)	0.20–0.45
Beasley et al. (58)	0.90
Harlin and Barardi (59)	1.50
USDA (60)	0.52
Pimentel et al. (61)	0.68
Uri and Lewis (36), 1982	1.67
Uri and Lewis (36), 1997	1.08
Wilkinson and McElroy (50)	0.89