Armstrong Research and Demonstration Farm
Each spring and fall a soil moisture survey is conducted to determine the amount of plant-available moisture in the top five feet of many of the major soils in Iowa. Several of the sites are located in the Wallace Foundation for Rural Research and Development (WFRRD) area. Many producers make or alter their crop management plans according to expected soil moisture levels.
Iowa State University
Olsen, Carroll; McGrath, Clarke; White, Michael L.; and Kohl, Kris, "Soil Moisture Survey" (2001). Iowa State Research Farm Progress Reports. 1704.