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• <br /> <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 drainage is possible; <br />4. A conductivity of 8 mmhos/cm or less in the upper 40 inches and permeability is greater than .2 <br />inches/hr. (moderately slow or greater) if the slope is less than 2 percent. These soils are <br />considered capable of being managed so that all horizons within a depth of 40 inches (1 meter) or in <br />the root zone if it is less than 40 inches will have a conductivity of the saturated extract of less than 4 <br />mmhos/cm and the exchangeable sodium percentage (ESP) is less than 15; irrigated soils with <br />bedrock within 40 inches of the surface and soil horizons that have a pH higher than 7.4 are <br />considered as having high conductivity and therefore not prime; <br />5. 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 for the production of specific high <br />value food and fiber crops. It has the special combination of soil quality, location, growing season, <br />and moisture supply needed to economically produce sustained high quality and/or high yield of a <br />specific crop, when treated and managed according to acceptable farming methods. Two areas in <br />Colorado are considered Unique Farmlands of National Importance -- the fruit orchards in the Grand <br />Valley and the Detta-Montrose areas, and the seed potato and fruit and vegetable producing areas <br />of the San Luis Valley. <br />• (Revised 2/00) 2.04.9-67 <br />