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Soil-moisture data collected since 1954 have been summarized for 22 locations in Iowa. Plant-available water for each year for each foot . increment down to 5 feet have been presented for each station for April 15 and the first of each month to Nov. 1. The actual values given for each month are produced by a soil-moisture calculation procedure.
Iowa State University. Agricultural and Home Economics Experiment Station
Agronomy and Crop Sciences
Shaw, R. H.; Felch, R. E.; and Duncan, E. R., "Soil moisture available for plant growth in Iowa" (1972). Special Report. 67.