Slope gradients are 0 to 3 percent. In uncultivated areas, gilgai microrelief is evident. The mean annual temperature is 46 degrees to 48 degrees F., and the mean summer temperature is 67 degrees to 70 degrees F. Frost-free period is 120 to 130 days. These are the Collett, Greenson, and Nibley soils and the competing Logan and Salt Lake soils. Collett, Greenson, and Nibley soils lack both parallelepipeds and control sections.
Nibley soils have argillic horizons.
These soils are used for production of irrigated alfalfa, small grains and sugar beets. The native vegetation is meadow foxtail, gumweed, Kentucky bluegrass, saltgrass, and cheatgrass. Low lake terraces in south-central Cache County, Utah. The series is inextensive. The Cardon soils were formerly classified as Grumusols.