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Table 10.
Calculation of Soil Productivity Multipliers

Soil Productivity Class Average Maximum Potential Productivity in Southern United States (cu. ft./acre/yr.)   Average Maximum Potential Productivity (cu. ft./acre/yr.)  Productivity Multiplier
I 163 / 123.00 = 1.33
II 123 / 123.00 = 1.00
III 85 / 123.00 = .69
IV 60 / 123.00 = .49
Source: Average Maximum Potential Productivity from Boyce Study