Laserfiche WebLink
soils with an 0 horizon is higher than 47o F (So C); it is higher than 59o F <br />. (15o C) in soils that have no O horizon. <br />(iii) The soils have a pH between 4.5 and 8.4 in all horizons within a depth <br />of 40 inches (1 meter) or in the root zone if the root zone is less than 40 <br />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 cropping season to allow <br />cultivated crops common to the area to be grown. <br />(v) The soils can be managed so that, 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 <br />deep, during part of each year the conductivity of the saturation extract is <br />less than 4 mmhos/cm and the exchangeable sodium percentage (ESP) is <br />less than 15. <br />(vi) The soils are not flooded frequently during the growing season (less <br />than once in 2 years). <br />(vii) The product of K (erodibility factor) x percent slope is less than 2.0, <br />and the product of I (soils erodibility) x C (climatic factor) does not exceed <br />60. <br />(viii) The soils have a permeability rate of at least 0.06 inch (0.15 cm) per <br />hour in the upper 20 inches (50 cm), and the mean annual soil temperature <br />at a depth of 20 inches (50 cm) is less than 59o F (15o C). The <br />. permeability rate is not a limiting factor if the mean annual soil temperature <br />is 59o F (15o C) or higher. <br />(ix) Less than 10 percent of the surtace layer (upper 6 inches) in these <br />soils consists of rock fragments coarser than 3 inches (7.6 cm) in diameter. <br />(REVISED 9/99) 2.04.9-60 <br />