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• BEGAY SERIES <br />LOCATION BEGAY UT+AZ, CO <br />Established Series <br />Rev. RLM/GWURLB <br />4/98 <br />The Begay series consists of very deep, well drained, moderately rapidly permeable <br />soils that formed in eolian deposits, derived mainly from sandstone. Begay soils are on <br />structural benches and broad mesas and have slopes of 0 to 30 percent. The average <br />annual precipitation is about 12 inches, and the mean annual temperature is about 48 <br />degrees F. <br />TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Ustic Haplocambids <br />TYPICAL PEDON: Begay loamy fine sand, rangeland. (Colors are for air-dry soil unless <br />otherwise noted.) <br />A--O to 3 inches; yellowish red (5YR 516) loamy fine sand, yellowish red (5YR 4/6} moist; <br />single grained; loose; very slightly effervescent, carbonates are disseminated; <br />moderately alkaline (pH 7.9); clear smooth boundary. (2 to 5 inches thick) <br />Bw--3 to 16 inches; yellowish red (5YR 5/6) very fine sandy loam, yellowish red (5YR <br />4/6) moist; weak medium subangular blocky structure; soft, friable; common fine roots; <br />few fine pores; slightly alkaline (pH 7.8); clear wavy boundary. (11 to 17 inches thick) <br />Bki--16 to 28 inches; yellowish red (5YR 5/6) very fine sandy loam, yeilowish red (5YR <br />4/6) moist; weak medium subangular blocky structure; slightly hard, firm; few fine roots; <br />common fine pores; very slightly effervescent, carbonates are disseminated; moderately <br />• alkaline (pH 7,9); gradual wavy boundary. (10 to 14 inches thick) <br />Bk2--28 to 42 inches; yellowish red (5YR 5/6) very fine sandy loam, yellowish red (5YR <br />4/6) moist; weak medium subangular blocky structure; slightly hard, firm; strongly <br />effervescent, moderately alkaline (pH 8.0); gradual wavy boundary. (12 to 16 inches <br />thick) <br />C--42 to 60 inches; yellowish red (5YR 5/8) very fine sandy loam, yellowish red (5YR <br />4/8) moist; massive; soft, very friable; few fine pores; very slightly effervescent, <br />carbonates are disseminated; strongly alkaline (pH 8.1 ). <br />TYPE LOCATION: San Juan County, Utah; 7 miles east and 5 miles north of Navajo <br />Mountain School; SW 1/4, SE 1/4 sec. 31, T. 42 S., R. 17 E. <br />RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 47 to <br />57 degrees F. The mean summer soil temperature at a depth of 20 inches ranges from <br />61 to 65 degrees F. In 7 out of 10 years the soils are dry in all parts of the moisture <br />control section for 50 to 75 percent of the time (cumulative) that the soil temperature at <br />depth of 20 inches is above 41 degrees F. The soils are moist in some part of the <br />moisture control section for 30 to 40 days during the summer and are dry in some part of <br />the moisture control section for 60 to 90 consecutive days during winter and early spring <br />and are moist in some parts between July and October. <br />The combined thickness of the A and B horizons is 35 to 50 inches. The depth to <br />secondary carbonates ranges from 12 to 22 inches. The series particle-size control <br />section ranges from 15 to 40 percent fine sand or coarser and 0 to 15 percent rock <br />fragments. <br />The A horizon has hue of 2.5YR through 10YR, value of 4 through 6 dry, 3 through 5 <br />• (REVISED 9/99) 2.04.9-29 <br />