F. The soil temperature at 20 inches is 41 degrees F. or warmer for 175 to 195 days. Organic carbon in upper 40 cm. Textures are sandy loam, fine sandy loam, very fine sandy loam, and loam. Reaction is neutral or mildly alkaline. Textures are silty clay loam, fine sandy loam, very fine sandy loam, silt loam, loam, and clay loam.
Reaction is typically neutral through moderately alkaline but is slightly acid in some pedons.
This horizon is absent in some pedons. Exchangeable sodium is 3 to 12 percent. It is slightly or moderately alkaline. Textures are the same as for the Bt horizon. Reaction is strongly or very strongly alkaline.