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Specific criteria. Prima farmlands meet all the following criteria: <br />Terms used in this section are defined in USI& publications: "Soil <br />Taxorcny, Agriculture Handbook 436'"; "Suit Suc - vey Manual, <br />Agriculture Handbook 18 "; "Rainfall— Erasion Lcsses from Cropland, <br />Agriculture Handb k 282 "; "mind Erosion Forcea in the Unit d States <br />arse] Their Use in Predicting Soil Loss, agriculture Handbook 346" and <br />"Saline and A.Ikali Soils, Agriculture Hard book 60. <br />1. The soils have: <br />a. Aquic, odic, ustic, or xeric rv)i.sture regimes and sufficient <br />available water capacity within a depth of 40 inches (1 meter), or <br />V in the root zone (root zone is the part of the soil that is <br />penetrated or can be penetrated by plant roots) if the ;coot zone is <br />less than 40 inches deep, to produce the eo my gran cultivated <br />craps ( cultivated craps include, but are not limited to, drain, <br />forage, fiber, oilzeed, suer beets, sugarcane, vegetables, tobacco, <br />orchard, vineyard, and bush fruit crc3ps) adapted to the region in 7 <br />or m_sre years out of 10: or <br />b. Xeric or ustic misture regimes in which the available water <br />capacity is limited, but the area has a developed irrigation water <br />supply that is dependable (a 6ependable water supply as one in which <br />enough water is available for irrigation in 8 out of 10 years for <br />the crops oxmnly groan) and of adapate quality; or, (the term <br />adequate si;pply of water as used in the text of this report is <br />synonymous with dependable water supply). <br />c. Aridic or Itcrric moisture regimes and the area has a <br />developed irrigation water supply that is dependable and of adequate <br />quality; and, <br />2. The soils have a temperature regime that is frigid, mesic, <br />thermic, or hyperthermic (pergelic and cryic regimes are excluded). <br />These are soils that, at a depth of 20 inches. (50 cm) , have a mean <br />annual temperature higher than 32 (0 °C). In additioi), the mean <br />summer temperature at this depth in soils with an 0 horizon is <br />higher than 47 °F (8 in soils that have no D horizon, the mean <br />surm)er tee rapture is higher than 59 °F (15 1 C); and, <br />3. The soils have a pH between 4.5 and 8.4 in all horizons within a <br />depth of 40 inches (1 meter) or in the rat zone if the root zone is <br />less than 40 inches deep: anJ <br />4. The soils either have no water table ear have a water table that <br />is maintained at a ouffi°:ientu depth during the cropping season to <br />allow cultivated crops comT*n to the area to be gr ; and, <br />5. The soils can be managed so that, in all horizons within a depth <br />of 40 inches (1 meter) or in the root zone if the root zone is less <br />than 40 inches deep, during part scf each year the conductivity of <br />the saturation extract is less than 4 wboslcm and the exchangeable <br />sodium percentage (ESP) is less than 15; and, <br />OA <br />