Site Characteristic Line Item

Phosphorus Vulnerability Values

1. Soil Erosion

Soil Loss (tons/acre/yr) × 1

(Revised Universal Soil Loss Equation ver. 2, RUSLE2)

Includes: Map Unit, Crop Management Zone, Climate, Farmer Management, Slope Length/Steepness

2. Connectivity to Water.

Does concentrated flow (via a defined waterway, tile inlet, or surface drain leave the site?

No, and the site is NOT adjacent to an intermittent or perennial stream

No, but the site IS adjacent to an intermittent or perennial stream.

Yes, but the site is Not adjacent to an intermittent or perennial stream

Yes, and the site IS adjacent to and/or the concentrated flow outlets into an intermittent stream or through a tile inlet.

Yes, and the site IS adjacent to and/or the concentrated flow outlets into a perennial stream or through a tile inlet; OR Outlets to a pond or lake within 1 mile.

Value = 0

Value = 4.0

Value = 8.0

Value = 12

Value = 16

3. Runoff Class

Represents the effect of the Hydrologic Soil Group (A, B, C, D) combined with the effect of slope steepness. This factor represents the site’s surface runoff vulnerability

See Runoff Class Matrix (0 to 15 points)

4. Soil Test Bray-Kurtz P1 PPM

Bray-Kurtz P1 (PPM) × (0.07)

Application Rate

5. Fertilizer (P₂O₅)

7. Organic (P₂O₅)

Fertilizer (P₂O₅) Applied (Lbs/Acre × 0.05)

Available Manure/Biosolids (P₂O₅) (lbs/Acre × 0.06)

Fertilizer OR Manure (P₂O₅) Application Method

0 Applied

Immediate Incorporation

OR

Applied on 80% Cover

Incorporation <1 Week

OR

Applied on 50% - 80% Cover

Incorporation >1 Week <3 months

OR

Applied on 30% - 49% Cover

No Incorporation

OR

Incorporation >3 months

OR

Applied on <30% Cover

6. Fert. App. Meth.

Value = 0

Value = 0.75

Value = 1.5

Value = 3.0

Value = 6.0

8. Man. App. Meth.

Value = 0

Value = 0.5

Value = 1.0

Value = 2.0

Value = 4.0

9. Filter Strip

Deduct 2 points if field runoff flows through a designed filter strip-minimum 33 ft. wide

Ohio Phosphorus (P) Risk Index scores and abridged interpretations

P Index Score

P Transport Risk

Abridged Interpretation of P Index and Management

<15

Low

Manure or biosolids can be applied to meet the recommended nitrogen requirements for next grass crop or nitrogen removal of the next legume crop

15 to 30

Medium

Runoff reduction practices should be considered to reduce P loss impacts. Manure/biosolids can be applied to meet the recommended nitrogen requirements for next grass crop or nitrogen removal of the next legume crop. Applications of P at the crop removal rate should be considered

31 to 45

High

Runoff reduction practices should be considered to reduce P loss impacts. Limit application of P to crop removal rates

>45

Very High

Remedial action is required to reduce the risk of P loss. A complete soil and water conservation system is needed. Apply no additional P