Total Land Area 282,450 square miles (731,905 square kilometers).
Portions of 14 states are placed in this Land Resource Region. In order of area percentage:
Iowa - 20 percent
Illinois - 18 percent
Missouri - 13 percent
Minnesota - 11 percent
Indiana - 9 percent
Kansas - 6 percent
Nebraska - 6 percent
Ohio - 6 percent
Wisconsin - 4 percent
South Dakota - 4 percent
Oklahoma - 2 percent
Michigan - 1 percent
Also, very small parts are in North Dakota and Kentucky.
Typically, the land surface is a nearly level to gently sloping, dissected glaciated plain
The average annual precipitation is typically 32 to 39 inches (815 to 990 millimeters)
The range varies from 19 in the northern part, to 48 inches in the south part of this region (485 to 1,220 millimeters). increasing from north to south.
In most of the region, the average annual temperature is 47 to 53 degrees F (8 to 12 degrees C).
The range varies from 38 in the northern part, to 62 degrees F in the southern part of the region(4 to 17 degrees C).
The freeze-free period generally is 170 to 210 days. It increases in length from north to south.
35,945 million gallons per day (136,050 million liters
87% of withdrawl (approx) is from surface water sources.
13% of withdrawl is from ground water sources.
This is one of six land resource regions that use more than 30,000 million gallons per day (113,550 million liters per day).
Abundant precipitation and numerous perennial streams provide ample supplies of good-quality surface water for all uses in the region. The lower reaches of the large rivers in the southern part of the region have poor-quality water primarily because of sediment, nutrients, and pesticides from agricultural runoff.
The dominant suborders are Udalfs, Aqualfs, and Aquolls. The sandy soils are typically Psamments.
Almost all regional soils have a mesic soil temperature regime.
All have an aquic or udic soil moisture regime.
mixed or smectitic mineralogy
99% (approx) privately owned.
This region produces most of the corn, soybeans, and feed grains produced in the U.S.
Small areas in the parts of this region in southern Indiana and in Illinois are strip-mined for coal.
The major soil resource concerns are water erosion, wetness, and maintenance of the content of organic matter and productivity of the soils. Wind erosion is a hazard in some of the northern parts of the region where the lighter textured soils occur. Protecting wildlife habitat and preserving the quality of surface water and ground water are additional concerns in many parts of this region.