LOCATION BOGA CAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Haploxeralfs
TYPICAL PEDON: Boga loam on a less than 1 percent slope in a field about to be leveled for peaches at an elevation of 90 feet, (27 m). When described on 8/15/94, the soil was slightly moist below 6 inches, (15 cm) due to nearby irrigation and irrigation canals. (Colors are for dry soil unless otherwise stated)
Ap1--0 to 3 inches, (0 to 8 cm); pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; 24 percent clay; moderate fine and medium subangular blocky structure; very hard, firm, nonsticky and slightly plastic; common very fine and few fine roots; many very fine and fine tubular pores; neutral, pH 7.0 by Hellige-Truog; abrupt smooth boundary.
Ap2--3 to 6 inches, (8 to 15 cm); pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; 25 percent clay; moderate coarse subangular blocky structure parting to medium subangular blocky; very hard, firm, nonsticky and slightly plastic; common very fine and few fine roots; many very fine and fine, common medium and few coarse tubular pores; neutral, pH 7.0 by Hellige-Truog; abrupt smooth boundary. (Combined thickness of the Ap horizon is 2 to 10 inches, (5 to 25 cm) thick).
Bt1--6 to 14 inches, (15 to 36 cm); pale brown (10YR 6/3) clay loam, brown (10YR 4/3) moist; 28 percent clay; weak medium subangular blocky structure; very hard, firm, slightly sticky and slightly plastic; common very fine and few fine roots; many very fine and fine, common medium and few coarse tubular pores; few patchy distinct clay films on ped faces and in pores; slightly acid, pH 6.5 by Hellige-Truog; gradual smooth boundary.
Bt2--14 to 29 inches, (36 to 74 cm); light yellowish brown (10YR 6/4) clay loam, dark yellowish brown (10YR 4/4) moist; 30 percent clay; moderate medium subangular blocky structure; very hard, firm, slightly sticky and moderately plastic; common fine roots; many very fine and fine and common medium tubular pores; common discontinuous distinct clay films on ped faces and in pores; slightly acid, pH 6.5 by Hellige-Truog; gradual smooth boundary.
Bt3--29 to 53 inches, (74 to 135 cm); light yellowish brown (10YR 6/4) clay loam, dark yellowish brown (10YR 4/4) moist; 28 percent clay; moderate medium subangular blocky structure; very hard, firm, slightly sticky and moderately plastic; few fine to coarse roots; many very fine and fine and common medium tubular pores; common discontinuous distinct clay films on ped faces and in pores; slightly acid, pH 6.5 by Hellige-Truog; gradual smooth boundary.
Bt4--53 to 73 inches, (135 to 185 cm); light yellowish brown (10YR 6/4) loam, dark yellowish brown (10YR 4/4) moist; 26 percent clay; weak medium subangular blocky structure; very hard, firm, slightly sticky and moderately plastic; few fine to coarse roots; many very fine and fine and common medium tubular pores; few fine black (N 2/0) moist, irregularly shaped iron-manganese masses throughout; few discontinuous distinct clay films in root channels and pores; slightly acid, pH 6.5 by Hellige-Truog; abrupt wavy boundary. (Combined thickness of the Bt horizon is 50 to 78 inches, (129 to 198 cm) thick)
2Cd--73 to 80 inches, (185 to 203 cm); dark yellowish brown (10YR 4/4) loam, olive brown (2.5Y 4/4) moist; 18 percent clay; noncemented; massive; extremely hard, friable, nonsticky and slightly plastic; no roots; many very fine and fine and few medium tubular pores; common fine and medium dark yellowish brown (10YR 4/4) moist, irregular and thread shaped oxidized iron masses on fragment faces and in pores; slightly acid, pH 6.5 by Hellige-Truog.
TYPE LOCATION: Butte County, California; about 2 miles southeast of Gridley, approximately 1050 feet east and 150 feet north of the intersection of Larkin Rd. and Clardy Avenue;. T.17 N., R.3 E.; in an unsectionized area in the Boga Land Grant; 39 degrees, 20 minutes, 31 seconds North latitude and 121 degrees, 39 minutes, 17 seconds West longitude, NAD27. U.S.G.S. Quad: Gridley, California.
RANGE IN CHARACTERISTICS: Depth to densic material is 60 to 80 inches, (152 to 203 cm). The mean annual soil temperature is 62 to 64 degrees F, (17 to 18 degrees C). The soil moisture control section is dry from May to October (140 to 160 days). The particle-size control section averages 25 to 35 percent clay. Mineralogy is mixed. Organic matter ranges from 1 to 3 percent to a depth of 6 inches, (15 cm). A fluctuating water table can occur between the top if the densic material and 20 inches, (51cm) below the surface of the soil from December through May.
The Ap horizon dry color is 10YR 5/3, 5/4 or 6/3. Moist color is 10YR 4/3 or 4/2. Texture is loam or silt loam. Clay content ranges from 18 to 27 percent. Reaction ranges from slightly acid to neutral.
The Bt horizon dry color is 10YR 5/3, 5/4, 5/6, 6/4 or 6/6. Moist color is 10YR 4/2, 4/3, 4/4, 5/3, 5/4 or 7.5YR 4/3. Texture is loam, silt loam, silty clay loam or clay loam. Clay content ranges from 20 to 40 percent. Sand content ranges from 15 to 50 percent. Redoximorphic features such as iron-manganese masses (N 2/0) moist and oxidized iron masses (10YR 4/6, 7.5YR 4/4, 4/6, 5/6, 5YR 4/6, 5/6) moist, occur below 40 inches, (102 cm). Reaction ranges from slightly acid to slightly alkaline.
The 2Cd horizon dry color is 2.5Y 7/4, 7/3, 6/4, 10YR 4/4 or 6/4. Moist color is 2.5Y 4/4, 5/3, 5/4 or 10YR 4/4. Texture is loam, silt loam, silt, very fine sandy loam or fine sandy loam. Clay content ranges from 5 to 20 percent. Redoximorphic features such as iron-manganese masses (N 2/0) moist, and oxidized iron masses (10YR 4/6, 7.5YR 4/4, 4/6, 5/6, 5YR 4/6, 5/6) moist, occur in pores and on fragment faces. Rupture resistance ranges from slightly hard to very hard and varies within the same horizon. The densic material does not slake in water and the cementation class is noncemented. This material usually has many very fine and fine tubular pores that appear to be remnant root channels. Reaction ranges from slightly acid to moderately alkaline.
COMPETING SERIES: These are the Arbuckle, Esparto, Loemstone, Nodhill, Pinspring(T), and Snelling soils. Arbuckle soils are very deep, well drained, and have more than 15 percent gravel in the argillic horizon. Esparto soils have stratified C horizons with greater than 50 percent sand. Loemstone soils have a densic contact at 40 to 60 inches, (102 to 152 cm). Pinspring(T) soils are very deep, have Btq horizons, and are mildly to moderately alkaline throughout. Nodhill soils are well drained and are 20 to 40 inches, (51 to 102 cm) to weakly cemented sediments. Snelling soils are well drained and are 20 to 40 inches, (51 to 102 cm) to a lithic contact. Tivy and Blasingame soils are moderately deep to paralithic contact. Montpellier, Fallbrook, Ramona and Wyman soils are redder than 10YR. Wasioja soils do not have a densic contact. Pomo and Clearhayes soils are deep. Sesame soils are moderately deep.
GEOGRAPHIC SETTING: Boga soils are on Feather River terraces. Slopes range from 0 to 1 percent. These soils formed in alluvium of the Lower Modesto formation deposited over unrelated root restrictive sediments. Elevation is 75 to 105 feet, (23 to 32 m). The mean annual precipitation is 19 to 21 inches, (483 to 533 mm). The mean annual temperature is 60 to 61 degrees F, (16 degrees C). Frost free season is 240 to 250 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gianella, Eastbiggs, Liveoak, Gridley Taxadjunct and Loemstone soils. Eastbiggs soils are moderately deep to a duripan, fine and are on the Riverbank Formation. Gianella soils lack an argillic horizon and are on floodplains. Liveoak soils have a mollic epipedon, lack an argillic horizon and are in the abandoned channels of the Lower Modesto terrace. Gridley Taxadjunct soils are moderately deep to a duripan and are fine. Loemstone soils are on the same position as Boga soils but are 40 to 60 inches, (102 to 152 cm) to densic material.
DRAINAGE AND PERMEABILITY: Moderately well drained; medium runoff; moderate saturated hydraulic conductivity in the Ap horizon, moderate to moderately slow in the Bt horizon and very slow in the 2Cd horizon. Water occasionally ponds up to 1 inch, (2.5 cm) above the surface for brief duration from December through March. A fluctuating water table can occur between the top of the densic material and 20 inches, (51cm) below the surface of the soil from December through May.
USE AND VEGETATION: This soil is used for Peaches, Nectarines, Kiwis, Walnuts and Prunes.
DISTRIBUTION AND EXTENT: Butte County and Sutter County, California. MLRA 17 - Sacramento Valley. The soils are of small extent, occurring mainly in the Gridley area.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Butte County, California 2005. Source of name from the Boga Land Grant.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - zone from 0 to 6 inches, (0 to 15 cm) (Ap1,Ap2).
Argillic horizon - zone from 14 to 29 inches, (36 to 74 cm) (Bt2).
Densic contact (lithologic discontinuity) at 73 inches, (185 cm) (2Cd).
Soil moisture control section - zone from 6 to 17 inches, (15 to 43 cm).
Particle-size control section - zone from 14 to 29 inches, (36 to 74 cm).
ADDITIONAL Data: Classification based on data from Loemstone S95CA-007-005 NSSL Lincoln, NE.