2010-04-14_GENERAL DOCUMENTS - C1981008 (2)

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6. Th4 soils are not flooded frequently during the ,growing season (less often than once in 2 year - s) ; and,. 7. The product of K (erodibility factor) x percent slope is less tna-,R 2.0, and the product of 1 (soils erodibilit,y) x C (climatic factor) does not exceed 60; and 8. The sails have a permeability rate of at least 0.06 inch (0.15 am) per hour in the upper 20 inches (50 cm) and the mean annual soil temperature at a depth of 20 inches (50 cm) is less than 59 ° F (15 ; the permeability rate iS not a limiting factor if the mean annual soil temperature i5 59 (15 C) or higher; and, 9. Less than 10 percent of the surface layer (upper 6 inches) in these sails consists of rack fragm —ants coarser than l inches (7.6 cm) . The following wdifica.tions and /or interpretations of the National Criteria for Prime Farmland were used in Colorado. The soil must have: 1. A developed irrigation water supply that is dependable and adequate to rr.eet moisture requirement:; 8 out of 10 years and have 4 inches or more available water capaci within a depth of 40 inches (1 meter) , or within the root zone if the root tone is les than 40 inches; 2. A growing season of 90 days or mare; 3. No water table or the warier table is below. a depth of 1.5 feet and drainage is passible; 4. A conductivity of 8 rmnhos /cm or l ess in the upper 40 inches and permeability is greater than .2 inc;-es /nr. (moderately sloe or greater) if the slope is less than 2 percent. These sails are considered capable I of being managed s0 that all horizcns within a depth of 40 inches (1 metier) or in the root zone if it is less than 40 inches will have a conductivity of the saturated extract of legs than 4 mmhcs /cm and the exchangeable sodium percentage (ESP) is ie5s than 15; irrigated soi s')with`6i i'cckv within 40 ZItCh' Caf ± E t -Farp• a!'Y[� _ t 41 -� UT 126 h , , aelf than 7:T art considered as having high conductivity -and there €are not prune; S. 51ope of irrigated prizrre f will not exceed 6 percent. Uni©ue Farmland Unique Farmland is land caner than Prime Farmland that is used for the production of specific high value food and fiber craps. It has the special combination of soil quality, location, growing season, and moisture supply needed to economically produce sustained high quality and /or high yield of a specific crop, when treated and managed according to acceptable farming methods. Two areas in Colorado are considered Unique Farmlands of National Ir portance -- the fruit orchards in the Grand Valley and the Delta - Montrose areas, and the seed potato and fruit and vegetable producing areas of the San Luis Malley.