The current drought in Iowa created unfavorable soil conditions not only for plant development and growth, but also changes in soil structure. These changes in soil structure may include fracturing and cracking of the upper 6 to 15 inches of most Iowa soils. However, continuous fracturing and cracking to depths greater than 15 to 20 inches occurs only in a few Iowa soils, primarily those soils high in clay content with expansible clay minerals. Soils that have high clay content within the soil profile, more than 45 percent clay, are generally limited to flood plains adjacent to rivers and streams and some upland landscapes in southern Iowa. These high clay content soils are a minority of the soil types that occur in Iowa.
Iowa State University
Al-Kaisi, Mahdi, "Dry Soil Conditions and Liquid Manure Application" (2012). Integrated Crop Management News. 121.
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