Table 1. Landuse and landcover for MLRA 153A, Atlantic Coast Flatwoods (from USDA Agriculture Handbook 296, 1981).
Landuse
Acres
Hectares
% Cover
Agricultural
806,534
326,400
3.86
Forest
9,562,770
3,870,000
45.81
Range
41,018
16,600
0.20
Water and marsh
826,796
334,600
3.96
Pasture and agricultural
216,212
87,500
1.04
Forest and agricultural
5,321,298
2,153,500
25.49
Forest and pasture
21,003
8,500
0.10
Forest and range
8,401
3,400
0.04
Forest and marsh
241,169
97,600
1.16
Range and agricultural
89,450
36,200
0.43
Forest, agricultural and range
3,734,916
1,511,500
17.89
Barren and other
4,447
1,800
0.02
Total land area
20,874,014
8,447,600
100.00

 
 
 
Table 2. Area of Soil Components comprising 1% or more of the 8,447,600 hectares of land area in MLRA 153A (from NRCS-USDA data base).
Component Taxonomy Area Percent of
MLRA Area
acres
hectares
Rains Typic Paleaquults, fine-loamy, siliceous, semiactive, thermic 725,078 293,657 3.47
Goldsboro Aquic Paleudults, fine-loamy, siliceous, thermic 719,642 291,455 3.45
Lynchburg Aeric Paleaquults, fine-loamy, siliceous, semiactive, thermic 611,148 247,515 2.93
Pelham Arenic Paleaquults, loamy, siliceous, subactive, thermic 586,351 237,472 2.81
Leon AericAlaquods, sandy, siliceous, thermic 510,342 206,689 2.45
Norfolk Typic Kandiudults, fine-loamy, kaolinitic, thermic 427,747 173,238 2.05
Mascotte Ultic Alaquods, sandy, siliceous, thermic 369,627 149,699 1.77
Pantego Umbric Paleaquults, fine-loamy, siliceous, semiactive, thermic 336,752 136,385 1.61
Coxville Typic Paleaquults, fine, kaolinitic, thermic 315,479 127,769 1.51
Rutlege Typic Humaquepts, sandy, siliceous, thermic 289,237 117,141 1.39
Croatan Terric Haplosaprists, loamy, siliceous, dysic, thermic 287,137 116,290 1.38
Sapelo UlticAlaquods, sandy, siliceous, thermic 236,835 95,918 1.13
Leaf TypicAlbaquults, fine, mixed, active, thermic 229,556 92,970 1.1
Bladen TypicAlbaquults, fine, mixed, semiactive, thermic 227,944 92,317 1.09
Ocilla Aquic Arenic Paleudults, loamy, siliceous, semiactive, thermic 219,956 89,082 1.05
Craven Aquic Hapludults, fine, mixed, subactive, thermic 217,883 88,243 1.04
Plummer Grossarenic Paleaquults, loamy, siliceous, subactive, thermic 210,876 85,405 1.01
Total   6,521,590 2,641,245 31.24

 
 
 
 
Table 3. Soil bulk density, texture, selected soil water characteristic data, and in situ field capacity of Aycock (Site RMT-77-SP) (unpublished data, D.K. Cassel).
       
--- Particle Size ---
------ Soil Water Content ------
Horizon
Soil
Depth
Bulk
Density
Saturated
Hydraulic
Conductivity
Sand
Silt
Clay
-10 kPa
-33 kPa
-1500 kPa
In situ
Field
Capacity
 
cm
g cm-3
cm h-1
--- % by weight ---
  ----------------- g g-1 -------------------
Ap1
0-15
1.46
0.67
63
25
12
.195
.144
.058
.183
Ap2
15-23
1.58
0.76
63
25
12
.195
.144
.058
.179
AB
23-36
1.49
1.14
55
25
20
.234
.180
.091
.197
Bt1
36-46
1.50
0.72
45
25
30
.279
.223
.130
.205
Bt2
46-61
1.47
0.75
45
25
30
.279
.223
.130
.218
Bt3
61-91
1.51
0.31
41
22
37
.325
.263
.167
.224
Bt4
91-122
1.55
0.21
40
19
40
.342
.275
.184
.222
Bt5
122-150
1.56
0.035
40
20
40
.359
.280
.183
.220
BC
150-183
-
-
44
24
32
.318
.238
.145
-

 
 
 
Table 4. Mathematical models describing unsaturated hydraulic conductivity (cm h-1) for Aycock (Site RMT-77-SP) measured with the instantaneous profile method (unpublished data, D.K. Cassel).
Soil depth
Model
Limits of volumetric
water content q
r2
cm
cm3 cm-3
0-15
ln K= -19.01 + 41.56q
0.281-0.345
0.88
15-23
ln K= -26.31 + 66.84q
0.294-0.336
0.92
23-36
ln K= -23.10 + 55.99q
0.310-0.362
0.96
36-46
ln K= -43.99 + 115.55q
0.328-0.370
0.99
46-61
ln K= -53.59 + 126.81q
0.371-0.401
0.95
61-91
ln K= -67.67 + 158.67q
0.389-0.401
0.97

 
 
 
Table 5. Soil bulk density, texture, selected soil water characteristic data, and in situ field capacity of Craven (Site NB-78-Cr) (unpublished data, D.K. Cassel).
 
 
 
 
--- Particle Size ---
------ Soil Water Content ------
Horizon
Soil
Depth
Bulk
Density
Saturated
Hydraulic
Conductivity
Sand
Silt
Clay
-10 kPa
-33 kPa
-1500 kPa
In situ
Field
Capacity
 
cm
g cm-3
cm h-1
--- % by weight ---
  --------------- g g-1 -------------------- 
A
0-13
1.38
1.4
39
54
7
.339
.230
.037
.241
E
13-25
1.49
2.0
31
44
25
.299
.239
.071
.207
BE
25-33
-
-
-
-
-
-
-
-
.274
Bt1
33-45
1.43
1.0
22
33
45
.375
.309
.193
.274
Bt2
45-61
1.48
0.2
35
27
38
.375
.299
.178
.294
Bt3
61-102
1.52
2.0
36
28
36
.321
.237
.137
.271
BCg1
102-122
1.47
1.0
42
25
33
.356
.254
.148
.280
BCg2
122-152
1.40
0.1
36
34
30
.375
.279
.157
.314

 
 
 
Table 6. Soil bulk density, texture, selected soil water characteristic data for Leon (Site LEON-78-1) (unpublished data, D.K. Cassel).
 
 
 
 
--- Particle Size ---
------ Soil Water Content ------
Horizon
Soil
Depth
Bulk
Density
Saturated
Hydraulic
Conductivity
Sand
Silt
Clay
-10 kPa
-33 kPa
-1500 kPa
 
cm
g cm-3
cm h-1
--- % by weight ---
  -------------- g g-1 --------------- 
A
0-10
1.05
179
96
3
1
.067
.043
.033
E1
10-45
1.49
86.3
98
1
1
.017
.012
.012
E2
45-74
1.50
198
98
1
1
.016
.011
.010
Bh1
74-102
1.36
1.4
91
5
4
.130
.092
.053
Bh2
102-127
1.52
8.9
95
3
2
.055
.040
.029
Bh3
127-152
1.63
6.5
96
1
3
.051
.036
.017

 
 
 
 
Table 7. Mean and CV for percent sand, silt and clay; bulk density; soil water characteristics and hydraulic conductivity for A, Btg, and Bg horizons of Portsmouth sandy loam (after Anderson and Cassel, 1986).
 
A horizon
Btg Horizon
Bg Horizon
Soil property
Mean
CV
Mean
CV
Mean
CV
 
% by weight
%
% by weight
%
% by weight
%
Sand
73
11
75
14
84
11
Silt
17
34
14
39
10
55
Clay
10
42
11
34
6
82
 
g cm-3
%
g cm-3
%
g cm-3
%
Bulk density
1.30
16.0
1.49
14.9
1.70
5.2
Soil
A horizon
Btg Horizon
Bg Horizon
water pressure
Mean
CV
Mean
CV
Mean
CV
Hydraulic conductivity*
kPa
mm d-1
%
mm d-1
%
mm d-1
%
0.0
3800
190
7000
3300
1500
500
-3.0
11
130
12
330
17
370
-5.0
7.6
130
8.4
400
10
410
-7.5
3.9
190
4.5
390
5.9
370
-10
2.4
240
2.8
390
3.7
360
-25
0.53
360
0.50
420
0.70
430
-50
0.17
410
0.15
450
0.18
460
-100
0.056
450
0.046
470
0.049
470
-500
0.0051
530
0.0027
350
0.0020
300
-1000
0.0016
440
0.00098
370
0.00066
320
-1500
0.00088
450
0.00053
370
0.00034
320
Soil-water content
 
cm3 cm-3
%
cm3 cm-3
%
cm3 cm-3
%
0.0
0.457
15.6
0.391
25.3
0.310
22.4
-0.8
0.428
16.0
0.354
21.0
0.298
21.7
-1.5
0.413
15.4
0.345
19.7
0.295
21.0
-3.0
0.384
14.8
0.327
19.2
0.277
21.1
-6.0
0.341
20.2
0.298
23.7
0.242
23.6
-10
0.314
24.0
0.272
28.8
0.206
27.6
-25
0.281
26.8
0.239
35.9
0.168
33.8
-50
0.258
28.5
0.219
39.9
0.147
38.0
-100
0.164
29.6
0.127
40.7
0.084
61.8
-1500
0.096
29.5
0.075
47.8
0.044
78.3
* The mean and coefficient of variation, CV, were computed using the mean and variance of logarithmic- transformed data.

 
 
 
 
Table 8. Soil bulk density, texture, selected soil water characteristic data, and In situ field capacity of Rains (Site K-76-R) (unpublished data, D.K. Cassel).
              -------- Soil Water Content -------- Available
      Saturated             In Situ Water Capacity
  Soil Bulk Hydraulic Particle Size       Field -10kPa - -33kPa -
Horizon Depth Density Conductivity Sand Silt Clay -10kPa -33kPa -1500kPa Capacity (-1500kPa) (-1500kPa)
  cm g cm-3 cm h-1 % by weight --------------- g g-1 -------------- -------- cm --------
Ap 0-23 1.45 1.08 71 21 8 0.207 0.158 0.041 0.17 5.6 3.9
BA 23-36 1.72 0.65 71 16 13 0.167 0.126 0.05 0.125 2.6 1.7
Btg1 36-56 1.72 0.23 68 18 14 0.176 0.136 0.053 0.138 4.2 2.9
Btg2 56-91 1.75 0.045 65 19 16 0.194 0.146 0.058 - 8.3 5.4
Ng3 91-122 1.77 0.021 63 18 19 0.193 0.145 0.069 - 6.8 4.2
BCg 122-152 1.78 0.018 70 13 17 0.201 0.154 0.072 - 6.9 4.4

 
 
Table 9. Mathematical models describing ln unsaturated hydraulic conductivity (cm h-1 ) for Rains measured by the instantaneous profile method (unpublished data, D.K. Cassel).
Soil depth
Model
Limits of volumetric
water content q
r2
cm
cm3 cm-3
0-23
ln K= -12.52 + 23.12q
0.272-0.332
0.55
23-36
ln K= -11.66 + 38.99q
0.229-0.257
0.20
36-56
ln K= -23.19 + 70.19q
0.252-0.276
0.69