Soils have varying production capacities for a specific plant or sequence of plants under defined management strategies. The production capacity or “productivity” can be quantified as a mathematical function of a soils ability to sufficiently sustain plant growth and development. The result of this function is a productivity index value that can be used to estimate crop yield and develop management strategies. This paper demonstrates a simulation of how erosion and loss of soil organic carbon can impact productivity, profitability, and energy efficiency for a typical corn production field in South Dakota. Energy and productivity values are calculated in an MS Excel workbook using data sourced from an online soil survey and a biofuel systems model. These data used with spatial soils data to demonstrate the spatial variation of these parameters within a field.