After you have collected yield data for over five or more years, you can look at Multi-Year Yield Analysis. The Multi-Year Yield analysis derives high, medium, and low management zones from at least five years of yield data. From these management zones, we calculate the highest average corn and soybean yield goal for each field. The corn and soybean yield goals are then used in variable rate plant food, nitrogen, and seed recommendations. If intensive sampling has already been done on the field, then we can create a sampling scheme based on past fertility and management zones.