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I <br />i <br />MAP UNIT DESCRITPION' <br />Map Unit: 55 — Norka -Colby slit loams, 3 to 5 percent slopes <br />Component: Norka (50 %) <br />The Norka component makes up 50% of the map unit. Slopes are 3 to 5 %. This component is <br />on the plains. The parent material consists of fine -silty loess, calcareous. Depth of a root <br />restrictive layer is greater than 60 inches. The natural drainage class is well drained. Water <br />movement in the most restrictive layer is moderately high. Available water to a depth of 60 <br />inches (or restricted depth) is high. Shrink -well potential is low. The soil is not flooded. It is not <br />ponded. There is no zone of water saturation within a depth of 72 inches. Organic matter <br />content in the surface horizon is about 2 percent. This component is in the R072XY001CO <br />Loamy Plains ecological site. Non - irrigated land capability classification is 4e. Irrigated land <br />capability classification is 4e. This soil does not meet hydric criteria. The calcium carbonate <br />equivalent within 40 inches, typically, does not exceed 10 percent. <br />I <br />Component: Colby (35%) <br />The Colby component makes up 35% of the map unit. Slopes are 3 to 5 %. This component is <br />on plains. The parent material consists of fine -silty loess, calcareous. Depth to a root restrictive <br />layer is greater than 60 inches. The natural drainage class is well drained. Water movement in <br />the most restrictive layer is moderately high. Available water to a depth of 60 inches (or <br />restrictive depth) is high. Shrink -swell potential is low. The soil is not flooded. It is not ponded. <br />There is no zone of water saturation within a depth of 72 inches. Organic matter content in the <br />surface horizon is about 1 percent. This component is in the 11072XY001CO Loamy Plains <br />ecological site. Non - irrigated land capability classification is 4e. Irrigated land capability <br />classification is 4e. This soil does not meet hydric criteria. The calcium carbonate equivalent <br />within 40 inches, typically, does not exceed 8 percent. <br />I <br />L -3 <br />