Holdrege silt loam covers 1.8 million acres of land in south-central Nebraska, under a grass landscape. Good drainage and moisture movement resulted in the downward movement of clay and lime. First described in 1917 in Phelps County, Nebraska, the soil has a significant role in corn, grain and soy farming. Formed in silty, calcareous loess, the soil ranges from 0 to 15 percent slope. 
- "Holdrege -- Nebraska State Soil". University of Illinois Extension. Retrieved October 5, 2017.
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