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McClave series. The McClave series is made up of deep, somswhat poorly drained soils, These soils formed on low terraces ar;d bottom lands in loamy alluvium. Slopes are 0 to 1 percent. Elevations are 4,900 to 5,500 feet, The native vegetation is mainly short grasses. Annual precipitation is 12 to 18 inches, Mean annual air temperature is 48° to 52°L'., and the frost-free season is about 140 to 155 days. In a representative profile the surface layer, about tl0 inches thick, is dark gracish-brown and grayish-brown light clay loan that is_mottled in the lower part. The under- lying naterial is mottled, brown light clay loam that extends to a depth of 60 inches or more. Soil reaction is neutral. McClave soils have moderate permeability. Available •aater capacity for the entire profile is high. Roots can o:netrste to a depth of 60 inches or more, and the seasonal hig'.1 water table is at a depth between 2 end 4 feet. These soils are used for irrigated crops and pastures„ Representative profile of McClave clay loam, located 950 feet south and 60 feet west of the center of sec.'1, T. 2 K., R.6q 'd. ; • Ao - 0 to 7 inches, dark grayish-brown (10`!R 4/c) light clay loam, very dark brown (10~'R 2j2) when moist; stron3, medium, grannular structure; soft, very friable; neutral; clear, smooth boundary. A1? - 7 to 19 inches, grayish-brown (101'R 5/2) light clay loam, ver^ darts gra~;ish brown (10YR 3/2) when moist; week, fine, sub- angular blocky structure: hard, firm; neutral; ¢radusl, wavy boundary. A13g-1q to 40 inches, grayish-brown (10'rR 5/2) light clay loam with many fine, distinct, brown (7,5YR 5/4) mottles; very dark gray- ish brown (10YR 3/2) when moist; weak, medium, subangular blocky structure; hard, firm; neutral; gradual, wavy boundary, C1g - 40 to 60 inches, brown (10YR 5/3) light cla;t loam With many, large, distinct, brown (7.5~'R 5/4} mottles; brown (10°R 4/3) when moist; massive slightly hard, very friable; neutral. i