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<br />. <br /> <br />. <br /> <br />c..J <br />00 <br />w <br />o <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />horizon is common, giving to the suborder, Ar gids. Soils in the Aridisol <br /> <br />order usually have calcium carbonate accumulation in their profile. The <br /> <br />presence of gypsum is also of common occurrence. Because of the low <br /> <br />I <br />rainfall, [he leaching of salts does not occur and thus these soils tend to <br /> <br />reflect various degrees of salinity, depending on their location in the <br /> <br />landscape and their parent material. The agricultural use of Aridisols <br /> <br />is limited chieflyby the lack of water. Their productivity when water is <br /> <br />available can be high if proper irrigation management techniques are <br /> <br />used. <br /> <br />Entisols are the young, immature soils that are found on the steep <br /> <br />mountain slopes and recent alluvial bottoms. These geologically you'lger <br /> <br />soils have not developed any subsurface diagnostic horizons. When these <br /> <br />soils are of sufficient depth they can support an irrigated agriculture. <br /> <br />Being associated with Aridisols in the Colorado River Basin they exhibit <br /> <br />a salinity hazard range from negligible to very high. Entisols include the <br /> <br />extremes of productive soils on recent alluvium to infertile soils on <br /> <br />barren sands. <br /> <br />A high proportion of the Entisols tend to be shallow, with less than <br /> <br />20 meters to bedrock. This, coupled with steep slopes and sparse cover, <br /> <br />fosters rapid runoff. Water erosion is severe and gullying and bank cutting <br /> <br />is common. This effect is particularly noted in the shale badlands of Utah <br /> <br />and Colorado. <br /> <br />The Mollisols are associated with the cool temperatures and moist <br /> <br />II <br /> <br />, <br /> <br />;,t",..o;! <br />