Table S6.

Summary of land area in Iowa by slope class and relevant land-use categories

Slope classAll fields*, haAll agricultural fields, haAll row-crop fields, haAll corn or soybean fields, haAll fields*, %All agricultural fields, %All row-crop fields,%All corn or soybean fields, %
  • * The all-fields category includes all agricultural fields and fields not currently in agricultural production (e.g., fallowed or set aside).

  • Agricultural fields include grass hay (Bromus spp., Fescue spp.), alfalfa (Medicago sativa), and pasture fields in addition to row-crop fields.

  • Row crops grown in Iowa are primarily corn and soybean but also include small grain, fruit, and vegetable crops.