Soil can vary from one point to the next in its chemical and physical makeup, which makes it very diverse. Crop yield and variations within the field can be influenced by soil properties, or pollutants that move through soil, and then into the groundwater, or runoff into lakes and streams. The impor...

A. Introduction During the last twenty years, industrial livestock farms have been replacing the traditional family size farms that once raised most of the nation's swine. The number of livestock animals produced in the United States has grown modestly in the past two decades, but the nu...