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6. The sails are not flooded freguently during the growing season <br />(less often than once. in 2 year); and, <br />7. The product of K (erodibility factor) x percent slope is less than <br />2.0, and the product of I (soils erodibility) x C (climatic factor) <br />does not exceed 6D; and, <br />8. The soils have a permeability Tate of at least 0.06 inch (0.15 cm) <br />per hour in the upper 20 inches X50 cm) and the mean armuai <br />tem.Derature at a depth of 210 inches (50 cm) is less than 59 F (15 °C) ; <br />the permeability rate i not a limiting factor if the mean annual sail <br />tenperature is 59 (15 C) or higher; and, <br />9. —'ess than 10 percent of the surface layer (upper 6 inches) in these <br />soils consists of rock fragments coarser than 5 inches (7.6 cm). <br />The foilcm -i difi;aticns and /or interpretations of the national. <br />Criteria for Prime Farmlands were used in Colorado. <br />The snit must ha ve <br />1. A developed irrigation water supply that is dependable and adequate <br />to meet moisture requirejnenr 9 Out of 20 years and have 4 i,ncnes or <br />more available water capacity within a depth ='"40 inches (1 meter), cr <br />within the root zone if the root zone is less than 40 inches; <br />2, A growing season of 90 days or more; <br />3. No water table or the water table is below. a depth of 1.5 feet and <br />drainage is possible„ <br />4. A conductivity of 6 mrnbc* /cm or less in the upper 40 inches and <br />permeability is greater than .2 inches/hr. (moderately slow or greater) <br />if the slope is less than 2 percent. These sails are considered capable <br />of being rrnaged so that all horizons within a depth of 40 inches (1 mater) <br />or in the root cone if it is less than 40 inches will have a conductivity <br />of the saturated extract of tharl 4 mnihas /cm and the exchangeable <br />sodium percentage (ESP) is less than 15; irrrigated, n 1s'w �edicock <br />t h <br />within 40 inches cif .the���r �E[ �_= highA <br />than re ort 'ider'ed as having high corductivity`� and therefoie naf <br />p time; 41 <br />S. slope of irrigated prime farmland will not exceed 6 percent. <br />Unique Farmland <br />Unique Farmland is land other than Prime Farmland that is used fox the <br />production of specific high value food and fiber crops. It has the <br />special combination of soil quality, location, growing season, and <br />moisture supply needed to economically produce sustained high, goality <br />and/or high yield of a specific crop, when treated and managed according <br />to acceptable fanning methods. Twu areas in Colorado are considered <br />Unique Farmlands. of National Importance T-- the fruit orchards in the <br />Crdnd Valley and the Delra- ,Montrose areas, and the seed potato and <br />fruit and vegetable producing areas of the San Luis Valley, <br />J <br />