Utah State University Extension
Utah soils are inherently low in organic matter due to the desert climate and historically low plant growth rates. In Utah, soil organic matter levels are typically 0.25 to 1%, while regions with high rainfall such as the Midwest and Eastern United States have soils with as much as 7 to 10% organic matter.
Heaton, Kevin and Koenig, Rich, "Solutions to Soil Problems: V. Low Organic Matter" (2010). All Current Publications. Paper 958.