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Order I Soil Survey, New Horizon Aline <br />which enough water is available for irrigation in 5 out of 10 years <br />for the crops commonly grown) and of adequate quality; car, <br />(c) Aridic or tcrric moisture regimes, and the area has a <br />developed irrigation grater supply that is dependable and of <br />adequate quality. <br />(ii) The soils have a temperature regime that is frigid, mesic, thermic, <br />or hyperthermic (pergelic and cryic regimes are excluded). These soils <br />have, at a depth of 20 inches (50 cm), a mean annual temperature <br />higher than 32o F (Oo C). In addition, the mean summer temperature <br />at this depth in soils with an 0 horizon is higher than 47o F (8o C); it is <br />higher than 50o F (15c C) in soils that have no Q horizon. <br />(iii) 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 root zone if the root zone is less <br />than 40 inches deep. <br />(iv) The soils either have no water table or have a water table that is <br />maintained at a sufficient depth during the crapping season to allow <br />cultivated crops cammQn to the area to be grown. <br />(v) The soils can be managed so that, in all horizons within a depth of <br />40 inches (1 meter) or in the rent zone if the root zone is less than 40 <br />inches deep, during part of each year the conductivity of the saturation <br />extract is less than 4 mmhoslcrn and the exchangeable sodium <br />percentage (ESP) is less than 15. <br />(vi) The soils are not flooded frequently during the growing season <br />(less than once in 2 years). <br />(vii) The product of K (erc(Jibility factor) x percent slope is less than <br />2.0, and the product of I (soils erodibility) x C (clinnatic factor) does net <br />exceed 60. <br />(viii) The soils have a permeability rate of at least 0.06 inch (0.15 cm) <br />per hour in the upper 20 inches (50 cm), and the mean annual sail <br />temperature at .a depth of 20 inches (50 crn) is less than 59c F (15o C). <br />The permeability rate is not a limiting factor if the mean annual sail <br />temperature is 59c IF (15o C) or higher. <br />(ix) Less than 10 percent of the surface lager (upper 6 inches) in these <br />soils consists of rack fragments coarser than 3 inches (7.6 cm) in <br />diameter. <br />(430 VI -NSSH, 1996) <br />