2010-04-16_GENERAL DOCUMENTS - C1981008 (4)

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5. The soils can be managed so that, in all horizons within a depth of 40 inches (1 meter) or in the root zone if the root zone is les 0 inches deep), during part of each year the conductivity of the saturation extra is less than 4 mmhos/cm nd a exchangeable sodium percentage (ESP) is less than 15; and, rowin' on less often than once in 2 years) ; 6. The soils are not flooded frequently during the g and, 7. The product of K (erodibility factor) x percent slope is less than 2.0, and the product of I (soils erodibility) x C (climatic factor) does not exceed 60; and, 8. The soils have a permeability rate of at least 0.06 inch (0.15 cm) per hour in the upper 20 inches (50 cm) and the mean annual 0 soil temperature at a depth of 20 inches (50 cm) is less than 59 F (150C) the permeability rate 18 not a limiting factor if the mean annual soil temperature is 59 0 F (15 C)'or higher; and, 9. Less than 10 percent of the surface layer (upper 6 inches) in these soils consists of rock fragments coarser than 3 inches (7.6 cm). The following modifications and/or interpretations of the National Criteria for Prime Farmlands we r --DID used in Colorado. APR 16 Z010 The soil must have: Iji ?00 AW, Mining and Suety A developed irrigation water supply that is dependable and adequate to meet moisture. requiremer 8 out. of 10.years and have 4 inches.or more- available water capacitw it in a depth.of 40 inches.(1 e er), or within a root Zone If a root zone is less than 40 inches;2. A SMn of 90 days or more; NQ ` v'3 3. o edlabl" ater ble\s1e ow a de f 1 n ainage is ; 4. cA ty oor lehe u er 4(?ches and permeability is greater than .2 inches/hr. (moderately slow or greater) if the slope is less than 2 percent. These soils are considered capable of being managed so that all horizons within a depth of 40 inches (1 meter) or in the root zone (Revised June 2008} Attach ent 2.04.9-5-3 CD ?'.___