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• b. Soil Genesis and Morphology <br />Some generalizations regazding the land resources ofthe project site can be make in relation <br />to their most significant characteristics. The land of the terraces of the South Platte River, as <br />well as a major portion of the imgated uplands, are generally well suited to irrigated <br />agriculture. Moderately coarse to moderately fine soil textures predominate throughout the <br />unit area. These soils are generally well drained, both internally and externally, and a <br />minimum of chemical deficiencies or problems exists. Natural fertility is moderately high, and <br />with intensive use of fertilizers and soil amendments (standard practices in irrigated agriculture <br />in the lower valleys), fertility levels are maintained at a very high level. Some localized <br />problem areas of restricted internal or external drainage do exist; however, the most common <br />problem in this regard is the result of inefficient irrigation practices, resulting in some <br />accumulations of surface waste water in places throughout the general area. <br />The soils of the areas within the Central Colorado Water Conservancy District have not been <br />categorized in detail for the entire district, since the area involved is large and contains widely <br />varying soil types. Part of the areas involved lies south of the South Platte River in the <br />vicinity of Bijou Creek, and the detailed information outlined above includes these areas. It <br />can safely be stated, however, that the lands lying within this district, which include large areas <br />of the South Platte Valley from Denver to Greeley and parts of the pediments lying to the <br />north and west of the valley, contain well over 121,000 acres of some of the most highly <br />productive medium to moderately light-textured agricultural soils of eastern Colorado. <br />• There are 2 ] soil association groups found in Weld County. They are described as follows by <br />soil association number: <br />#3 Travissilla-rock outcrop association: Warm, shallow, well drained, sloping to steep soils <br />and Rock outcrop on upland breaks. <br />#18 Fluvaquents-fluvents association: Warm, deep, poorly drained and somewhat poorly <br />drained, nearly level soils on flood plains and (ow tetraces. <br />#19 Nunn-Haverson association: Warm, deep, well drained, nearly level soils on terraces. <br />#20 Ascalon-Platner-Stoneham association: Warm, deep, well drained, nearly level and <br />sloping soils on upland plains. <br />#2l Vona-Olney-Dwyer association: Warm, deep, well drained, gently sloping to <br />moderately steep soils on upland plains. <br />#25 Bankard-Wann association: Warm, deep, well drained to excessively drained and poorly <br />drained, nearly level and gently sloping soils on flood plains. <br />• #26 Briggsdale-Terry association: Warm, moderately deep, well drained, nearly level to <br />sloping soils on upland plains. <br />73 <br />