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Specific criteria. Prime farmlands meet all the following criteria: Terms used in this section are <br />defined in USDA publications: "Soil Taxonomy, Agriculture Handbook 436"; "Soil Survey Manual, <br />Agricuture Handbook 18"; "Rainfall-Erosion Losses from Cropland, Agriculture Handbook 282"; Land <br />Erosion Forces in the United States and Their Use in Predicting Soil Loss, Agriculture Handbook <br />346" and "Saline and Alkali Soils,. Agriculture Handbook 60." <br />1. The soils have: <br />a. Aquic, udic, ustic, or xeric moisture regimes and sufficient available water capacity within a <br />depth of 40 inches (1 meter), or in the root zone (root zone is the part of the soil that is penetrated or <br />can be penetrated by plant roots) if the root zone is less than 40 inches deep, to produce the <br />commonly grown cultivated crops (cultivated crops include, but are not limited to, grain, forage, fiber, <br />oilseed, sugar beets, sugarcane, vegetables, tobacco, orchard, vineyard, and bush fruit crops) <br />adapted to the region in 7 or more years out of 10: or <br />b. Xeric or ustic moisture regimes in which the available water capacity is limited, but the area <br />has a developed irrigation water supply that is dependable (a dependable water supply is one in <br />which enough water is available for irrigation in 8 cut of 10 years for the crops commonly grown) <br />and of adequate quality; or, (the term, adequate supply of water as used in the text of this report is <br />synonymous with dependable water supply). <br />c. Aridic or torric moisture regimes and the area has a developed irrigation water supply that is <br />dependable and of adequate quality; and, <br />2. The soils have a temperature regime that is frigid, mesic, thermic, or hyperthermic (pergelic and <br />cryic regimes are excluded). These are soils that, at a depth of 20 inches (50 cm), have a mean <br />annual temperature higher than 32 deg F (O deg C). in addition, the mean summer temperature at <br />this depth in soils with an O horizon is higher than 47 deg F (80 deg C); in soils that have no O <br />horizon, the man summer temperature is higher than 59 deg F (15 deg C); and, <br />3. The soils have a pH between 4.5 and 8.4 in all horizons within a depth of 40 inches (1 meter) or <br />in the root zone if the root zone is less than 40 inches deep; and <br />• (Revised 2/00) 2.04.9-65 <br />