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S _cific criteria. Prim farmlands meet all the following criteria: <br />Terms used in this Section are defined in US11A publications; `So }1 <br />Taxorxmv, Agriculture Eandbr 435 "Soil Survey Manual, <br />Agriculture HandbDok 18 "; "Rainfall — Erosion :Dsses from Cropland, <br />Agriculture Handbook 202" "Vind Erosion Forces in the United 5`,ates <br />and 'Their Use in Predicting Soil Lis, Agriculture HarObook 3416" and <br />"Saline and Alka 50 ils,, Agriculture Handbook 60. <br />I. The sails have-: <br />a. Aguic, Uaic, ust.ic, or xer; c moisture girnes and sufficient <br />available water capacity within a depth of 40 inches (1 meter), or <br />in the root zone ( root zone is the wrt of the sail that is <br />penetrated or can he penetrated by plant roots if the rcxit zone: is <br />less than 40 inc��es deep, to prcduv* the ==nly 9rc'n cLutivated <br />crops ( cultivated crams irrlude, but are not limited to, gain, <br />forage, fiber, oilseed, sugar beets, std arcane, vegev.ables, tobacco, <br />orchard, vineyard, and bush fruit crops) adapted tz the region in 7 <br />or mere gears out of 10: or <br />b. Xeric or ustic mc lstum regimes in w.ich the available water <br />capacity is limited, but the area has a developed irrigation water <br />supply that is dependable (a dependable water suppler is one in which <br />enough water is available for irrigation in S out of 10 years for <br />the crops = manly grown) and of adequate quality; or, ( the term <br />adequate supply of water as used in the text of this report is <br />synonymous with dependable water supply) . <br />C. A.ridic or torric moisture <br />develcpad irrigation water supply <br />quality; and, <br />regimes and the area has a <br />that is dependable and of adequate <br />2. The soils have a temperatures regime that is frigid, mesic, <br />the=;.c, or hyperthermic Cper'gelic and cryic regimes are axcluded) . <br />These are moils that, at a depth of 20 inches (50 =) , have a mean. <br />annual to perature Nigher than 32 °F (0 . In addition, the mean <br />summr temperature at this depth in sails with an C horizon is <br />higher tfLaz 47 (8 in soils that have no 0 horizon, the Mari <br />summer tempera Lure is higher than 59 (15 °C); ard, <br />3. �y soils have / a pH between 4.5 .. and 8.4 in all horizonz within a <br />depth of 40 inc 11 meter CSI' in Lhe root if he root zone is <br />less than 40 - inches deep, and <br />4. T he sails ,either have nD water tale or have a water table that <br />is maintained at a sufficient depth during the cropping season to <br />allow cultivated crops c ommn to the area to he groom; and, <br />5. The soils can be managed so thaw, in all horizons within a depth <br />of 40 inches (1 meter) or in the rot zone if the root zone is less <br />than 40 incites deep, durirx3 part of each year the ocnxductivityr of <br />the saturatiOn extract is less than 4 mmhos /cm and the exchwVeable <br />sodiLrn percentage (ESP) is less than 15; and, <br />2 <br />