\<@37\>Tensas Series

\<@33\>\<i\>*Major Land Resource Area:*\<p\> 131---Southern Mississippi
Valley Alluvium

\<@33\>\<i\>*Local physiographic area:*\<p\> Intermediate natural levees

\<@33\>\<i\>*Geomorphic setting:*\<p\> Convex ridges of natural levees
on alluvial plains

\<@33\>\<i\>*Parent material:*\<p\> Clayey over loamy alluvium

\<@33\>\<i\>*Geology:*\<p\> Alluvial flood plains

\<@33\>\<i\>*Drainage class:*\<p\> Somewhat poorly drained

\<@33\>\<i\>*Permeability class:*\<p\> Impermeable

\<@33\>\<i\>*Soil depth class:*\<p\> Very deep

\<@33\>\<i\>*Shrink-swell potential:*\<p\> Very high

\<@33\>\<i\>*Slope:*\<p\> 0 to 3 percent

\<@33\>\<i\>*Taxonomic classification:*\<p\> Fine, smectitic, thermic
Chromic Vertic Epiaqualfs

\<@27\>Associated Soils

\<@30\>The Tensas series is commonly associated with Dundee soils.

-   \<@49\>The Dundee soils are loamy throughout and are somewhat poorly
    drained.

\<@27\>Typical Pedon

\<@25\>Tensas clay in an area of Tensas-Sharkey clays, gently
undulating; in an area of row crops; 9.4 miles south on U.S. Highway 65
from Newellton, Louisiana, 1.8 miles west on State Highway 568, about
5.22 miles west on State Highway 802 to Mayflower, Louisiana, 1.04 miles
west and southwest on Mayflower Road, 1.66 miles south on a field road,
and 150 feet southwest of the road in a field; NW1/4NW1/4NE1/4 sec. 24,
T. 11 N., R. 10 E.; Gretna Green, Louisiana, USGS 7.5-minute quadrangle;
lat. 31 degrees, 55 minutes, 28.00 seconds north and long. 91 degrees,
23 minutes, 58.00 seconds west.

\<@23\>Ap---0 to 4 inches; dark grayish brown (10YR 4/2) clay; moderate
medium subangular blocky structure; firm, moderately sticky and very
plastic; many fine and medium roots throughout; few fine and medium
low-continuity tubular pores; 1 percent fine distinct irregular greenish
gray (5GY 5/1) iron depletions on surfaces along pores; 1 percent medium
distinct irregular brownish yellow (10YR 6/6) masses of oxidized iron on
faces of peds; strongly acid; clear wavy boundary.

\<@33\>Btg1---4 to 11 inches; grayish brown (2.5Y 5/2) clay; strong
medium angular blocky structure; firm, very sticky and very plastic;
many fine roots between peds; 50 percent distinct pressure faces on
faces of peds; 25 percent medium prominent irregular yellowish brown
(10YR 5/6) masses of oxidized iron on faces of peds; 15 percent medium
prominent irregular gray (2.5Y 5/1) iron depletions on faces of peds;
strongly acid; gradual smooth boundary.

\<@33\>Btg2---11 to 19 inches; grayish brown (2.5Y 5/2) silty clay;
strong medium angular blocky structure; firm, very sticky and very
plastic; many fine roots between peds; few fine low-continuity tubular
pores; 52 percent distinct gray (2.5Y 5/1) pressure faces on faces of
peds; 25 percent medium prominent irregular brownish yellow (10YR 6/8)
masses of oxidized iron on faces of peds; 1 percent very weakly cemented
charcoal fragments 2 to 3 millimeters in size; strongly acid; gradual
smooth boundary.

\<@33\>2Bg---19 to 30 inches; grayish brown (2.5Y 5/2) silty clay loam;
moderate medium angular blocky structure; firm, moderately sticky and
moderately plastic; few fine roots between peds; few fine low-continuity
tubular pores; 51 percent distinct gray (2.5Y 5/1) pressure faces on
faces of peds; 25 percent medium prominent irregular yellowish brown
(10YR 5/6) masses of oxidized iron on faces of peds; 2 percent medium
distinct irregular gray (10YR 5/1) iron depletions on faces of peds; 1
percent fine faint irregular reddish yellow (7.5YR 6/6) iron-manganese
masses on faces of peds; strongly acid; gradual smooth boundary.

\<@33\>2Bw---30 to 33 inches; brown (10YR 5/3) loam; weak fine
subangular blocky structure; friable, slightly sticky and slightly
plastic; many fine roots throughout; few medium moderate-continuity
irregular pores; 8 percent distinct grayish brown (10YR 5/2) clay films
on faces of peds; 15 percent medium prominent irregular strong brown
(7.5YR 5/6) masses of oxidized iron on faces of peds; 5 percent medium
prominent irregular grayish brown (10YR 5/2) iron depletions on faces of
peds; moderately acid; gradual smooth boundary.

\<@33\>2Bg´---33 to 42 inches; grayish brown (2.5Y 5/2) sandy clay loam;
weak fine subangular blocky structure; friable, nonsticky and
nonplastic; many fine roots throughout; many fine moderate-continuity
irregular pores; 15 percent medium prominent irregular yellowish brown
(10YR 5/8) masses of oxidized iron on faces of peds; 1 percent fine
faint irregular gray (5Y 6/1) iron depletions on surfaces along root
channels; moderately acid; diffuse smooth boundary.

\<@33\>2Bw´1---42 to 56 inches; light olive brown (2.5Y 5/3) very fine
sandy loam; massive; very friable, nonsticky and nonplastic; many fine
and medium roots throughout; many fine moderate-continuity irregular
pores; 25 percent medium distinct irregular yellowish brown (10YR 5/6)
masses of oxidized iron on faces of peds; 1 percent fine distinct
irregular gray (10YR 6/1) iron depletions on surfaces along root
channels; moderately acid; diffuse smooth boundary.

\<@33\>2Bw´2---56 to 70 inches; light olive brown (2.5Y 5/3) silt loam;
weak medium subangular blocky structure; friable, slightly sticky and
nonplastic; many fine and medium roots throughout; many fine
moderate-continuity dendritic tubular pores; 15 percent medium distinct
irregular yellowish brown (10YR 5/6) masses of oxidized iron on faces of
peds; 1 percent fine faint irregular grayish brown (10YR 5/2) iron
depletions on surfaces along root channels; 1 percent fine spherical
iron-manganese concretions; slightly acid; diffuse smooth boundary.

\<@33\>2Bg´´1---70 to 76 inches; gray (5Y 5/1) silty clay loam; weak
medium subangular blocky structure; friable, slightly sticky and
moderately plastic; many fine and medium roots throughout; many fine
moderate-continuity dendritic tubular pores; 25 percent medium prominent
irregular yellowish brown (10YR 5/4) masses of oxidized iron on faces of
peds; 1 percent fine faint irregular gray (5Y 6/1) iron depletions on
surfaces along root channels; slightly acid; diffuse smooth boundary.

\<@33\>2Bg´´2---76 to 86 inches; gray (5Y 5/1) silt loam; weak medium
subangular blocky structure; friable, slightly sticky and nonplastic;
many fine and medium roots throughout; many fine moderate-continuity
dendritic tubular pores; 25 percent medium prominent irregular yellowish
brown (10YR 5/6) masses of oxidized iron on faces of peds; 1 percent
fine faint irregular gray (5Y 6/1) iron depletions on surfaces along
root channels; slightly acid; diffuse smooth boundary.

\<@33\>2BCg---86 to 89 inches; olive gray (5Y 5/2) silty clay loam;
moderate medium angular blocky structure; firm, slightly sticky and
moderately plastic; few fine roots between peds; few fine low-continuity
dendritic tubular pores; 51 percent discontinuous distinct grayish brown
(2.5Y 5/2) pressure faces on faces of peds; 25 percent medium prominent
irregular yellowish brown (10YR 5/6) masses of oxidized iron on faces of
peds; 15 percent medium faint irregular light olive gray (5Y 6/2) iron
depletions in cracks; slightly acid.

\<@27\>Range in Characteristics

\<@33\>\<i\>*Thickness of the solum:*\<p\> 30 to more than 80 inches

\<@33\>\<i\>*Content of clay in the control section:*\<p\> 35 to 60
percent

\<@33\>\<i\>*Redoximorphic features:*\<p\> Iron-manganese depletions and
accumulations throughout

\<@33\>\<i\>*Other distinctive features:*\<p\> Loamy lithologic
discontinuity at a depth of 18 to 36 inches; common pressure faces in
clayey horizons; tubular pores in loamy horizons

\<@33\>\<i\>*Concentrated minerals:*\<p\> None

\<@23\>\<i\>*A or Ap horizon:*\<p\>

\<@31\>Color---hue of 10YR, value of 3 to 5, and chroma of 1 or 2

\<@31\>Redoximorphic features---iron-manganese accumulations and
depletions in shades of brown, yellow, and gray

\<@31\>Texture---clay, silty clay, or silty clay loam

\<@31\>Other distinctive features---None

\<@31\>Reaction---very strongly acid to neutral

\<@31\>Thickness---0 to 7 inches

\<@23\>\<i\>*Btg horizon:*\<p\>

\<@31\>Color---hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 2;
or, in some pedons that have subhorizons between the base of the A
horizon and a depth of 30 inches, hue of 10YR, value of 4 or 5, and
chroma of 1 or neutral in hue and value of 4 or 5

\<@31\>Redoximorphic features---iron accumulations and depletions in
shades of brown, yellow, and gray

\<@31\>Texture---clay or silty clay

\<@31\>Other distinctive features---dark coatings and pressure faces on
surfaces of peds in some pedons

\<@31\>Reaction---very strongly acid to moderately acid

\<@31\>Thickness---combined A and Btg horizons range from 18 to 36
inches

\<@23\>\<i\>*2Bg or 2Bw horizon:*\<p\>

\<@31\>Color---hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 2 or
3; or, in the lower part, hue of 2.5Y or 5Y, value of 4 or 5, and chroma
of 1 or 2; depth to layers with matrix chroma of 3 is 30 inches or more.

\<@31\>Redoximorphic features---iron-manganese accumulations and
depletions in shades of brown, yellow, and gray

\<@31\>Texture---very fine sandy loam through silty clay loam

\<@31\>Other distinctive features---few to many tubular pores

\<@31\>Reaction---strongly acid to neutral

\<@31\>Thickness---9 to 36 inches

\<@23\>\<i\>*2BCg or 2Cg horizon:*\<p\>

\<@31\>Color---hue of 2.5Y or 5Y, value of 4 or 5, and chroma of 1 or 2

\<@31\>Redoximorphic features---iron-manganese accumulations and
depletions in shades of brown, yellow, and gray

\<@31\>Texture---very fine sandy loam through silty clay loam

\<@31\>Other distinctive features---the number of pressure faces in the
lower part of the horizon ranges from none to common.

\<@31\>Reaction---strongly acid to neutral