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6, The sails are not flooded frequently during the growing season <br />;,less often than once in 2 years); and, <br />7 . The product of k (erodibility factor) x percent shape is less that. <br />2 .0, and the product of 1 (soils erodibility) x C (climatic facto <br />clues not exceed 60; and, <br />8. The soils have a permeahi lity rate of at least 0.06 inch (4.1S cm) <br />per hour in the upper 20 inches (50 gym) and the mean annual soil <br />temperature at a depth of 20 inches (50 cm) is less than 59 (15 <br />s the permeability rate ig not a limiting factor if the mean annual soil <br />temperature is 59 (15 C) or higher; and, <br />9. Less than 14 percent of the surface layer (upper 6 inches) in those <br />soils consists of rock fragments coarser than 3 inches (7.6 cm). <br />The following modifications and/or interpretations of the National <br />Criteria for Prime Farmlands were »sed in Colorado. <br />The soil Taus t have <br />1. A developer) irrigation Water supply that is dependablQ and adequate <br />to meet moisture requirements 8 Dut of 10 years and have 4 inches or <br />more available water capacity within a depth of 40 inches (1 meter), or <br />within the root zone if the root zone is less than 40 inches; <br />2. A growing season of 90 days or mare; <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 8 RrLhos /cm or less in the ripper 40 cinches and <br />perNAabil_ty is greater than .2 in,�hes /hr. (inoderateiy slow or greater) <br />if the slope is less than 2 percent. These soils are considered capable <br />of being managed so that all horizons within a depth of 40 inches (1 meter) <br />or in the root zone of it is less than 40 inches will have a conductivity <br />of the saturated extract of less than 4 nuazho.s /cm and the exchangeable <br />sodium percentage (}ASP) is less that 15; irrigated soils with bedrock <br />within 40 inches of the surface and sail horizons that have a PH higher <br />than 7.4 are considered as having higil conductivity a,Li therefore rcpt <br />Prime; <br />S. slope of irrigated prin-je farmland will not exceed 6 percent. <br />Unique Farmland <br />Unique Farmland is lard gather' than Trine Farmland that is used for the <br />production of specific high value food and fiber crops. It has the <br />special combination of suit. quality, location, growing season, and <br />moisture supply needed to economically produce sustained high quality <br />and/or high yield of a specific crop, when treated and managed according <br />to acceptable farming methods. Two areas in Colorado are considered <br />Unique Farmlands of National, Importance -- the fruit orchards in the <br />Grand Valley and the. ,Delta- Montrose areas, and the seed potato and <br />fruit and vegetable producing areas of the San Luis Valley. <br />3 <br />