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(v) The soils can be managed so that, in all horizons within a depth of 40 inches (1 meter) or in the root <br />zone if the root zone is less than 40 inches deep, during part of each year the conductivity of the <br />saturation extract is less than 4 mmhos/cm and the exchangeable sodium percentage (ESP) is less <br />than 15. <br />(vi) The soils are not flooded frequently during the growing season (less than once in 2 years). <br />(vii) The product of K (erodibility factor) x percent slope is less than 2.0, and the product of I (soils <br />erodibility) x C (climatic 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 upper 20 inches <br />(50 cm), and the mean annual soil temperature at a depth of 20 inches (50 cm) is less than 59o F (15o <br />C). The permeability rate is not a limiting factor if the mean annual soil temperature is 59o F (15o C) or <br />higher. <br />(ix) Less than 10 percent of the surface layer (upper 6 inches) in these soils consists of rock fragments <br />coarser than 3 inches (7.6 cm) in diameter. <br />(Revised June 2008) Attachment 2.04.9-3-46