Nutrient Management for Maryland Professional Edition (NuMan Pro) is an integrated software program that permits comprehensive nutrient management planning. The Maryland Phosphorus Site Index (PSI) has been integrated into the program so that warnings are given when a phosphorus site index calculation may be required based on soil test results. A simplified version of the Revised Universal Soil Loss Equation (RUSLE) model to predict soil erosion losses has been included in the program in support of the Maryland PSI assessment. Values for rainfall erosivity (R) and soil erodibility (K) factors are determined from field location and soils information entered in the initial portions of the program. Soil slope/steepness (LS), cropping management (C), and conservation management (P) factors are determined from simplified user inputs. Part A and Part B of the Maryland PSI are presented in a color-code scheme for user ease. Once slopes have been identified in the field, it is estimated that an experienced user can determine the Maryland PSI in less than 10 minutes.