Table 2.14 Texture and semi-quantitative composition of the topsoil and subsoil horizons in Huay Sang in Laos and Muong Lum in Vietnam
Soil
Luvisol 1982 (Muong Lum)
Alisol 1981 (Muong Lum)
Luvisol 1779 (Huay Sang)
Acrisol 1778 (Huay Sang)
Slope (%)
24
21
8
2
Horizon
À1 Ah
À2 Bt
À1 Ap
À3 Bt1
Ah
Bt
Ah
Bt
Depth (cm)
38
90
0–4
40–84
0–11
38–59
0–7
60–82
Skeleton (%) 0
0
0
0
0
15
0
0
Sand (%)
8.1
9.3
–
–
52.5
46.9
47.0
14.1
Silt (%)
27.1
30.5
–
–
25.0
20.6
27.5
40.0
Clay (%)
64.8
60.2
23.5
30.0
22.5
33.7
25.5
45.9
Mineralogy
Bulk
Clay
Bulk
Clay
Bulk
Clay
Bulk
Clay
Bulk
Clay
Bulk
Clay
Bulk
Clay
Bulk
Clay
(%)
Gibbsite
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Kaolinite
25
40
27
48
20
43
26
50
9
38
12
38
8
28
8
38
Illite
0
3
0
3
0
5
0
3
21
22
26
28
20
46
28
44
Intergrade
10–14 A ˚
0
6
0
6
0
1 1
0
8
0
2 0
0
1 2
0
1 4
0
9
Vermiculite
4
45
6
38
2
32
4
30
0
13
0
16
0
6
0
5
Chlorite
0
0
0
0
0
6
0
6
0
0
0
0
0
0
0
0
Quartz
37
0
39
0
48
0
46
0
61
0
45
0
67
0
56
0
Goethite
30
6
25
5
28
3
25
3
6
7
13
6
3
6
6
4
Hematite
2
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
88
K. Stahr et al.