LOCATION LAGONDA MOEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Aquertic Argiudolls
TYPICAL PEDON: Lagonda silt loam - on a 3 percent convex east-facing slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; black (10YR 2/1) silt loam, dark gray (10YR 4/1) dry; moderate very fine granular structure; friable; moderately acid; abrupt smooth boundary.
A--6 to 10 inches; black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; weak fine granular structure; friable; common prominent yellowish red (5YR 5/6) iron stains along root channels in the lower 2 inches; moderately acid; clear smooth boundary. (Combined thickness of the A horizon is 7 to 15 inches.)
BA--10 to 16 inches; very dark grayish brown (10YR 3/2) and very dark gray (10YR 3/1) silty clay loam, grayish brown (10YR 5/2) dry; strong fine and very fine subangular blocky structure; friable; few uncoated very fine sand or coarse silt grains on faces of peds; moderately acid; abrupt smooth boundary. (0 to 7 inches thick)
Bt--16 to 24 inches; dark yellowish brown (10YR 4/4) silty clay; weak medium prismatic structure parting to moderate fine subangular blocky; very firm; common faint clay films on faces of peds; discontinuous very dark gray (10YR 3/1) organic coatings on faces of peds; common fine distinct dark gray (10YR 4/1) iron depletions in ped interiors; few fine dark iron and manganese concretions; moderately acid; gradual smooth boundary. (0 to 10 inches thick)
Btg1--24 to 34 inches; dark grayish brown (2.5Y 4/2) silty clay loam; weak medium prismatic and angular blocky structure; firm; common faint clay films on faces of peds and in tubular pores; shiny faces oriented more nearly horizontal than vertical; common fine prominent yellowish brown (10YR 5/6) and few fine prominent yellowish red (5YR 5/6) masses of iron accumulation in ped interiors; few fine dark iron and manganese concretions; few sand grains; neutral; clear smooth boundary. (8 to 20 inches thick)
2Btg2--34 to 39 inches; dark gray (10YR 4/1) silty clay loam; weak coarse angular blocky structure; firm; common faint clay films on faces of peds and in tubular pores; common fine distinct dark yellowish brown (10YR 4/4) masses of iron accumulation in ped interiors; common fine soft dark accumulations of iron and manganese oxides; few coarse sand grains and fine pebbles; neutral; clear smooth boundary.
2Btg3--39 to 45 inches; dark grayish brown (2.5Y 4/2) silty clay loam; weak coarse angular blocky structure; firm; few faint clay films on faces of peds and in tubular pores; common fine prominent yellowish brown (10YR 5/4) and strong brown (7.5YR 5/6) masses of iron accumulation in ped interiors; few fine soft accumulations of iron and manganese oxides; few coarse sand grains and fine pebbles; slightly alkaline; gradual smooth boundary. (Combined thickness of the 2Btg horizon is 6 to 30 inches.)
3Btgb1--45 to 63 inches; dark grayish brown (2.5Y 4/2) clay loam; weak coarse prismatic structure, some cleavage planes; firm; few faint clay films on faces of peds; common fine prominent yellowish brown (10YR 5/4) masses of iron accumulation in ped interiors; few fine soft accumulations of iron and manganese oxides; few fine tubular pores; 1 percent fine gravel; moderately alkaline; gradual smooth boundary.
3Btgb2--63 to 75 inches; gray (5Y 5/1) clay; weak coarse prismatic structure; firm; few faint clay films on faces of peds; 1 percent fine gravel; few medium prominent strong brown (7.5YR 5/6) masses of iron accumulation which increase in size and number as depth increases; many soft dark accumulations of iron and manganese oxides; moderately alkaline.
TYPE LOCATION: Caldwell County, Missouri; 1 mile east and 1/2 mile south of Mirabile; 300 feet east and 100 feet north of the center, Sec. 3, T. 55 N., R. 29 W.
RANGE IN CHARACTERISTICS: The mollic epipedon ranges from 10 to 20 inches in thickness. Depth to a marked sand increase ranges from about 20 to 36 inches. The particle size control section averages 35 to 50 percent clay.
The A horizon has hue of 10YR, value of 2 or 3, 4 or 5 dry and chroma of 1 or 2. It is silt loam or silty clay loam. It is moderately acid to neutral.
The Bt horizon, if present has hue of 10YR, value of 3 or 4 and chroma of 3 or 4. The Btg horizon has hue 10YR or 2.5YR, value of 4 or 5 and chroma of 2. Texture is silty clay loam or silty clay. Reaction is moderately acid to neutral.
The 2Btg horizon is quite variable in dominant color; hue ranges from 10YR to 5Y. Value is 4 to 6, and chroma is 1 or 2. Masses of iron accumulation are distinct or prominent. It is silty clay loam or silty clay containing more than 5 percent sand or clay loam. Reaction is neutral or slightly alkaline.
The 3Btgb horizon has hue of 10YR to 5Y, value of 4 or 5, and chroma of 1 or 2. It is clay loam or clay. Reaction is neutral to moderately alkaline.
COMPETING SERIES These are the Adair, Arispe, Chase, Flanagan, Greenton, Grundy, Herrick, Ipava, Keller, Lamoni, Macksburg, Mahaska, Malvern, Martin, Mayberry, Pawnee, Rutland, Seymour, Shorewood, and Wymore soils. Adair soils contain more sand and more red mottles in the upper part of the argillic horizon. Arispe soils have less sand in the lower part of the solum. The Chase soils have mollic epipedons greater than 36 inches thick. Flanagan soils have less clay in the lower part of the solum. Greenton soils have color of higher chroma in the matrix of the argillic horizon and have formed in residuum from shale. Grundy, Ipava, Macksburg, Mahaska and Seymour soils contain less than 5 percent sand throughout their sola and formed in thick loess. Herrick soils have E horizons and contain less sand in the lower part of the sola. The Lamoni soils have more sand and contain pebbles in the upper part of the B horizon. Malvern soils have redder hue or redder mottles in the upper part of the B horizon. Martin soils have mollic epipedons more than 24 inches thick. Mayberry soils have redder hue in the B horizon. Pawnee soils contain more sand in the upper part of the sola and are drier in the soil moisture control section during the 120 days following the summer solstice. Rutland soils do not have pebbles and have less sand in the lower part of the solum. Shorewood soils formed in clayey lacustrine material and have a lower sand content. Wymore soils have less sand and do not have pebbles throughout the solum.
GEOGRAPHIC SETTING: Lagonda soils are on ridgetops and side slopes. Slope gradients range from 2 to 14 percent. They formed in 20 to 36 inches of loess or silty material underlain by pedisediment which is presumed to have washed from glacial till. This often is underlain by a paleosol in glacial till. The mean annual temperature ranges from 50 to 57 degrees F, and mean annual precipitation ranges from 32 to 40 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Adair, Clarinda, Grundy and Lamoni soils and the Sampsel and Shelby soils. The Adair, Clarinda and Lamoni soils are on lower slopes. Grundy soils are on higher and wider ridgetops. Shelby soils formed in glacial till, and are on lower positions in the landscape. Sampsel soils are wetter and contain less sand in the lower part of the sola. They may be on both higher or lower landscape positions.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Runoff is medium. Permeability is slow. A perched water table has an upper limit of 1.5 to 2.5 feet during November to April during most years.
USE AND VEGETATION: Lagonda soils are cropped to corn, soybeans, small grains, and to a lesser extent, for hay or pasture. Native vegetation is tall prairie grasses.
DISTRIBUTION AND EXTENT: North central and northwestern Missouri. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Chariton County, Missouri, 1938.
REMARKS: Diagnostic horizons and features recognized in this series are: mollic epipedon - the zone from the surface of the soil to a depth of 16 inches (Ap, A and BA horizons); argillic horizon - the zone from approximately 16 inches to 75 inches or more (Bt, Btg1, 2Btg2, 2Btg3, 3Btgb1 and 3Btgb2 horizons).