Missouri P index objectives Strategic planning tool for use in writing a 5-year nutrient management plan. Identify fields where field characteristics are likely to result in high P loss in runoff. Simple to use with readily available information for people with an NRCS conservation plan.
6 Factors in the Missouri P index Soil test result include units and sampling depth Tillage Tilled vs. notill and forages RUSLE estimate of erosion Land cover Soil hydrologic group A, B, C or D Distance from water feature
Simple model approach Sediment P Function of RUSLE-2 erosion, soil test P and sediment delivery ratio. Soluble P Function of runoff volume (curve number approach) and soil test P.
Surface applications require a tactical tool. Educational tools being developed to identify times of year runoff least likely Inputs: Ground cover- County Soil hydrologic group- Soil condition Soil moisture Output Evaluation of runoff risk (low, medium, high) Predicted rainfall amount needed to initiate runoff
Future P index integrated into RUSLE 2 Email notification system to help evaluate timing of manure applications.