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ific cri teria . Prim farmlands meet all the following criteria: <br />Term used in this section are define) in uSm publications: "sail <br />Taxoncar Agriculture Harsd 436"; "sail Survey Manual, <br />Agriculture Handbook 18 ", "Rainfall- Brosicn Lcsses frm Cropland, <br />Agriculture Handbook X62 "; 'Wind Erosicn Farces in the Unities Mates <br />and Thei Use in Predicting Soil Lis, Agriculture Ha rxlb ock 346" and <br />"Saline and Al'ca SO - LIS ", Agriculture liar4book 60. <br />I. The sails have: <br />a. Aquic, odic, ustic, or xeric =isture regimes and sufficient <br />available water capacity wit.�iin a depth of 40 inches (l meter), or <br />in the mot zone ( root zee is; the part cf the soil that is <br />penetrated or can be penetrated by plant tests) if the root zone is <br />less than 40 inches deem, to prrduce the commonly grcv�&n cultivated <br />crOPs (cultivated arcps include, but are not limited to, grain <br />forage, fiber, oi lseed, sugar beets, suga rcane , vegetables, tobacco, <br />orchard, vineyard, and bush fruit crops) adapted to they region in � <br />or rare gears out of JO: or <br />b. Xeric or 'astic moisture regimes in which the available water <br />capacity is .limited, but Lhe area has a cdevelcped I rigacion, water <br />supply t.�at is dependable (a c3ependable water supply is one in which <br />enough water is available for irrigation in 8 out of ' 0 tea for <br />the crops ==nly cgrcan) and of adequate quality; or, ( the terra <br />adequate supply cf' water as used in the text at this report is <br />synonymous with depen3able water sgpply�. <br />C. AL -idic or torri.c moisture <br />developed irrigation water supply <br />quality; and, <br />reg- mes and the area k s a <br />that is dependable aria of adequate <br />2. The sails have a tenperatur regime that is frigid, raesic, <br />t� c, or hyperthermiw (pergelic and cryic regimes are excluded <br />These are soils that, at a depth of 20 in:.1 (50 cry), have a mean <br />annual temperature higher than 32 °F (OOC) , in addition, the mean <br />SUITMZ' t a.-t this depth in soils with an a horizon is <br />nigher than 47 (8 in soils that have no 0 horizon, tt`je mean <br />see; t is higher than 59 ° F (15 4 0). and, <br />3. The soils have a pH between 4.5 and 8.4 in all horizans within a <br />depth of 4C inchen (1 teeter) or in the root zone if tine rwt zone is <br />less than 40 inches deep; and <br />4. The soils either have no water table or have a water table that <br />is maintained at a sufficient depth during they crapping season to <br />allow eu itivated , crops aoirmn to the area to be g ; own; and, <br />5. The sails can be managed so that, in all horizons within a depth <br />of 40 inches (l meter) or in tine root zone if the root zone is less <br />than 40 inches deep, during part of each year the conductivity of <br />the saturation extract is less than 4 dos /= and the exchangeable <br />soli= percnnncage (ESP) is less the 15; and, <br />2 <br />