Factor

Parameter

Explanatory Power

(%)

Ohio P Index Sub-value Inputs

Soil erosion

1

13.4

Connectivity to water

2

29.7

Runoff class

3

9.5

Soil test phosphorus

4

31.9

Fertilizer application amount

5

11.3

Fertilizer application method

6

2.2

Filter strip

9

2.0

Raw Component Inputs

Slope length

1

0.1

Slope steepness

1, 2, 3

19.1

Soil erodibility

1

0.0

Rainfall erosivity

1

0.2

Crop management

1, 5, 6

0.4

Soil texture

1

0.0

Concentrated flow leaving field

2

24.4

Stream adjacent

2

4.6

Hydrologic soil group

3

3.6

Soil test phosphorus

4, 5

36.5

Fertilizer application amount

5

6.0

Field cover

6, 1

0.1

Fertilizer incorporation/timing

6

2.4

Filter strip

9

2.7