Western 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 the major soils in Iowa. Adequate soil moisture reserves increase the probability of average or above-average crop yields the following season. Producers may use this information to alter crop management plans according to expected soil moisture levels. Several sampling sites are located at the Western Research Farm (WRF).
Iowa State University
Vagts, Todd, "Fall 2001 Subsoil Moisture Levels" (2002). Iowa State Research Farm Progress Reports. 1690.