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horizon is higher than 47 deg. F (8 deg. C); in soils that have no O horizon, the <br />mean summer temperature is higher than 59 deg. F (15 deg. C); and, <br />(iii) The soils have a pH between 4.5 and 8.4 in all horizons within a depth of 40 <br />inches (1 meter) or in the root zone if the root zone is less than 40 inches deep; and, <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 to the <br />area to be grown; and, <br />(v) The soils can be managed so that, in all horizons within a depth of 40 inches (1 <br />meter) or in the root zone if the root zone is less than 40 inches deep, during part of <br />each year the conductivity of the saturation extract is less than 4 mmhos /cm and the <br />exchangeable sodium percentage (ESP) is less than 15; and, <br />(vi) The soils are not flooded frequently during the growing season (less often than <br />once in 2 years); and, <br />(vii) The product of K (erodibility factor) x percent slope is less than 2.0, and the <br />product of I (soils erodibility) x C (climatic factor) does not exceed 60; and <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 20 <br />inches (50 cm) is less than 59 deg. F (15 deg. C); the permeability rate is not a <br />limiting factor if the mean annual soil temperature is 59 deg. F (15 deg. C) or higher; <br />and, <br />(ix) Less than 10 percent of the surface layer (upper 6 inches) in these soils consists <br />of rock fragments coarser than 3 inches (7.6 cm). <br />Revised September 2010 (PRO6) Attachment 2.04.9 -4 -2 <br />