Western Research and Demonstration Farm
Each spring and fall a soil moisture survey is conducted to determine the amount of plant-available water (PAW) to a five-foot soil depth. Adequate soil moisture reserves increase the probability of average or above average crop yields the following season. Producers may use this information to alter their crop management plans according to expected soil moisture levels. Several sampling sites are located at the Western Research and Demonstration Farm and other locations in west-central Iowa.
Iowa State University
Licht, Mark A., "Subsoil Moisture Levels for 2006" (2007). Iowa State Research Farm Progress Reports. 987.