The Drummer soil series is the state soil of Illinois. It was established in Ford County, Illinois, in 1929. Drummer Soil was named for Drummer Creek in Drummer Township. It consists of very deep, poorly drained soils that formed in 40 to of loess or other silty material and in the underlying stratified, loamy glacial drift. These soils formed under prairie vegetation. Drummer soil is the most abundant and extensive soil in Illinois. It occurs over more than in the state. It is the most productive soil in the state. Corn and soybeans are the principal crops grown in Drummer soil. The average annual precipitation in areas of Drummer soil ranges from 32 to . The average annual air temperature ranges from 48 to . Drummer is a fine-silty, mixed, superactive, mesic Typic Endoaquoll. This taxonomic classification is characteristic of the wet, dark-colored, prairie-derived soils of Illinois. See also Pedology (soil study) Soil types List of U.S. state soils References Pedology Soil in the United States Geology of Illinois Types of soil Symbols of Illinois