Average soil formation rate:
Geologic or natural erosion rate:
or
~ 1 ton per acre
USDA tolerable soil loss per year:
or 5 tons per acre
!!
~.25 mm per year = 2.5 Mg ha
-1
11 Mg ha
-1
!!
0.03 mm per year
or ~ 0.3 Mg ha
-1
or
~>0.1 ton per acre
!!