Land use patterns in Wisconsin have changed considerably over the past thirty years as have the management practices used in various agricultural enterprises. Forage based dairy production continues to be the dominant agricultural industry in the state with alfalfa still the predominant forage grown for feeding dairy animals. The total acreage of alfalfa has changed very little over the past thirty years, however, a large percentage of the concentration of the dairy industry in the state is found on the naturally acid soils of the state. This has resulted in the need for significant inputs of lime on fields where alfalfa is to be grown.