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Shaaa Series <br />• Depth class: Very deep <br />Drainage class: Well drained <br />Parent material: Alluvium <br />Landform: Foothills, mountains <br />Landscape position: Foothills, <br />stream terraces <br />Slope: 5 to 15 percent <br />Average annual precipitation: 15 <br />to 22 inches <br />Average annual air temperature: <br />45 to 47 degrees F <br />Taxonomic class: Fine-loamy, <br />mixed Pachic Haploborolls <br />Typical Pedon <br />Typical pedon of Shawa loam, 5 <br />to 15 percent slopes, about 100 <br />feet east and 2,200 feet north <br />of the southwest corner of sec. <br />23, T. 33.5, R. 67 W. <br />Al=0 to 17 inches; very dark <br />grayish brown (lOYR 3/2) loam, <br />very dark brown (lOYR 2/2) <br />• moist; moderate fine granular <br />structure; soft, friable, <br />slightly sticky and slightly <br />plastic; neutral; clear smooth <br />boundary. <br />A2=17 to 31 inches; dark grayish <br />brown (lOYR 4/2) loam, very dark <br />grayish brown (lOYR 3/2) moist; <br />weak medium subangular blocky <br />structure; soft, friable, <br />slightly sticky and slightly <br />plastic; slightly effervescent; <br />mildly alkaline; clear smooth <br />boundary. <br />C1=31 to 41 inches; grayish <br />brown (lOYR 5/2) clay loam, dark <br />grayish brown (lOYR 4/2) moist <br />and crushed; weak medium <br />prismatic structure parting to <br />moderate medium subangular <br />blocks; hard, firm, slightly <br />sticky and slightly plastic; <br />slightly effervescent; mildly <br />• alkaline; gradual smooth <br />boundary. <br />C2=41 to 60 inches; grayish <br />brown (lOYR 5/2) loam, dark <br />grayish brown (lOYR 4/2) moist; <br />massive; hard, firm, slightly <br />sticky and slightly plastic; <br />strongly effervescent; <br />moderately alkaline. <br />Range in Characteristics <br />Thickness of the mollic <br />epipedon: 20 to 50 inches <br />Depth to bedrock: 60 or more <br />inches <br />Content of coarse fragments in <br />the control section: 0 to 15 <br />percent <br />A horizon: <br />Texture=loam or clay loam <br />Clay content: 18 to 35 percent <br />Rock fragment content: 5 to 15 <br />percent <br />Reaction: neutral or mildly <br />alkaline <br />C horizon: <br />Texture=clay loam or loam <br />Clay content: 18 to 35 percent <br />Rock fragment content: 0 to 10 <br />percent <br />Reaction: mildly alkaline or <br />moderately alkaline <br />5-1-23 <br />