Table 2. Morphological description of the Pacolet
soil.
|
| Site location: |
Oconee County, Georgia. USDA-ARS Southern Piedmont Conservation Research
Center Laboratory West Unit. Nitrate leaching-evapotranspiration research
plots. |
| Position: |
summit/backslope |
| Slope: |
level to nearly level, 0 - 1% |
| Classification: |
Typic Kanhapludult; clayey, kaolinitic, thermic |
| Profile description: |
|
| Horizon |
Description |
| Oa: |
0-2 cm; very dark gray (10YR 3/1) muck. |
| Ap: |
2 to 18 cm; strong brown (7.5YR 5/6) coarse sandy loam; weak medium
subangular blocky structure; very friable; many medium and fine roots;
few red (2.5YR 4/6) fragments of B horizon; few very dark grayish brown
(10YR 3/2) infilled channels; few quartzite fragments up to 50 mm diameter;
clear smooth boundary. |
| BA : |
18 to 33 cm; red (2.5YR 4/6) sandy clay loam; moderate medium subangular
blocky structure; friable; many fine and very fine roots; few thin clay
films on ped faces; few tongues that appear to be infilled coarse channels;
tongues are yellowish brown (10YR 5/8) in the upper part and dark red (2.5YR
3/6) in the lower part; tongues have weak medium subangular blocky structure;
clear smooth boundary. |
| Bt1: |
33 to 54 cm; red (2.5YR 4/6) clay; weak coarse prismatic parting to
moderate medium subangular blocky structure; friable; common fine roots;
many very fine and fine pores; common medium clay films on vertical and
horizontal ped faces; few cylindrical pores that are lighter colored than
the matrix; few angular quartzite fragments up to 50 mm diameter; clear
smooth boundary. |
| Bt2: |
54 to 70 cm; red (2.5YR 4/6) clay; weak coarse prismatic parting to
moderate medium subangular blocky and weak thin platy structure; friable;
common fine roots; concentrations of roots (root mats) are common on vertical
prism faces and on horizontal plate faces; many very fine and fine pores;
common medium red (2.5YR 4/8) clay films on vertical and horizontal ped
faces; few cylindrical pores that are lighter colored than the matrix;
few angular quartzite fragments up to 50 mm diameter; ped faces are shiny
and wet; few fine mica flakes; clear smooth boundary. |
| BC1: |
70 to 123 cm; red (10R 4/6) sandy clay loam; few medium faint red (2.5YR
4/6) mottles primarily on faces where roots are present; moderate medium
subangular blocky and very weak very coarse prismatic structure; firm in
place; friable when disturbed; few fine roots primarily along prism faces;
few very fine and fine pores; few thin red (2.5YR 4/6) clay films on vertical
and horizontal ped faces; few angular quartzite fragments up to 50 mm diameter;
ped faces are shiny and wet; common fine mica flakes; clear smooth boundary. |
| BC2: |
123 to 175 cm; red (2.5YR 4/6) sandy loam; few medium faint red (2.5YR
5/6) and dark red (2.5YR 3/6) mottles; weak medium subangular blocky structure;
friable; few very fine roots; few very fine and fine pores; few angular
quartzite fragments up to 50 mm diameter; horizon has weak evidence of
relict bedding that is inclined about 30 o to horizontal; many fine mica
flakes; clear smooth boundary. |
| BC2: |
175 to 200+ cm; red (2.5YR 4/6) sandy loam; many medium distinct yellowish
red (5YR 4/6) mottles; massive; weak thin platy rock structure inclined
about 30 o to horizontal; friable; few very fine and fine pores; few angular
quartzite fragments up to 50 mm diameter; many fine mica flakes. |
|
| Described and sampled from pit face. Soil appears to have
a water table perched at upper boundary of BC1 horizon at 70 cm. Water
ran into pit from this surface, and there was a noticeable difference in
water content between Bt2 and BC1 horizons. Thickness of saturated zone
appears to be about 5 to 8 cm. |
(cm)