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• is higher than 47o F (8o C); it is higher than 59o F (15o C) in soils that have no <br />O horizon. <br />(iii) The sails have a pH between 4.5 and 8.4 in all horizons within a depth of 40 inches <br />(1 meter) or in the root zone'rf the root zone is less than 40 inches deep. <br />(iv) The soils either have no water table or have a water table that is maintained at a <br />sufficient depth during the cropping season to allow cultivated crops common <br />to the area to be grown. <br />(v) The soils can be managed so that, in all horizons within a depth of 40 inches <br />(1 meter) or in the root zone'rf the root zone is less than 40 inches deep, during <br />part of each year the conductivity of the saturation extract is less than 4 <br />mmhos/cm and the exchangeable sodium percentage (ESP) is less than 15.(vi) <br />The soils are not flooded frequently during the growing season (less than once <br />in 2 years). <br />(vii) The product of K (erodibility factor) x percent slope is less than 2.0, and the product <br />of I (soils erodibility) x C (Gimatic factor) does not exceed 60. <br />(viii) The soils have a permeability rate of at least 0.06 inch (0.15 cm) per hour in the <br />upper 20 inches (50 cm), and the mean annual soil temperature at a depth of <br />20 inches (50 cm) is less than 59o F (15o C). The permeability rate is not a <br />• limiting factor'rf the mean annual soil temperature is 59o F (15o C) or higher.(ix) <br />Less than 10 percentofthe surface layer(upper6 inches) in these soils consists <br />of rock fragments coarser than 3 inches (7.6 cm) in diameter. <br />(430-VI-NSSH, 1996) <br />• (Revised March 2006) Attachment 2.04.9-4-3 <br />