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Official Series Description - AFERSON Series • Page 2 of <br /> one-half the time the soil temperature is above 41 degrees F. (195 to 210 days)and is not dry for 45 <br /> consecutive days following July 15. <br /> ' The A horizon has hue of 2.5Y or 1 OYR, value of 5 or 6 dry, 3 through 5 moist and chroma of 2 or 3. <br /> When the value of the surface horizon is as dark as 5 dry and 3 moist, the horizon is thin enough so <br /> that if mixed to 7 inches it is too light colored or contains too little organic carbon to qualify as a <br /> ' mollic epipedon or are finely stratified. The A horizon usually has granular primary structure but it <br /> has subangular blocky structure in some pedons. It is soft or slightly hard. It is neutral through <br /> moderately alkaline. <br /> ' The C horizon has hue of 2.5Y through 7.5M value of 5 or 6 dry,4 or 5 moist and chroma of 2 or <br /> 3. It is slightly alkaline to strongly alkaline. It has from less-than-one to about 15 percent calcium <br /> carbonate equivalent which differs erratically from stratum to stratum. <br /> COMPETING SERIES: These are the Aparejo(NM), Hickman(NM), and Rock point (WY) <br /> ' series. Aparejo and Hickman soils are driest during May& June in the moisture control section, and <br /> Aparejo soils have hues of 5YR and redder. Rockypoint soils are dry from July through September. <br /> ' GEOGRAPHIC SETTING: The Haverson soils are on floodplains and low terraces of major <br /> rivers. Slope is 0 to 9 percent. The soils formed in highly stratified, calcareous, recent alluvium <br /> derived from mixed sources. At the type location the average annual precipitation is 14 to 18 inches <br /> ' with peak periods of precipitation occurring during the early spring and summer. The mean annual <br /> air temperature is 52 degrees F. and the mean summer temperature is 77 degrees F. The frost-free <br /> ' season is 125 to 180 days. <br /> GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bankard and Glenbere soils. <br /> Bankard and Glenberg soils have less than 18 percent clay in the series control section. <br /> DRAINAGE AND PERMEABILITY: Well drained; runoff is negligible to medium depending on <br /> slope; moderate permeability. <br /> USE AND VEGETATION: These soils are used as native pastureland,dry farm land or irrigated <br /> cropland. Native vegetation is mixed grasses, cottonwoods and brush. <br /> ' DISTRIBUTION AND EXTENT: Eastern Colorado and Wyoming, northeastern New Mexico and <br /> adjacent states. This soil is of large extent. <br /> ' MLRA OFFICE RESPONSIBLE: Bismarck, North Dakota <br /> SERIES ESTABLISHED: Prowers County, Colorado, 1965. <br /> REMARKS: Classification was changed from Ustic Torrifluvents to Aridic Ustifluvents and the <br /> type location moved from Prowers County to Weld County, Colorado in 3/94. <br /> National Cooperative Soil Survey <br /> ' U.S.A. <br /> 1 <br /> 1 <br />