turbidimetric cobaltinitrite method.
Page 358
Mg was determined colorimetrically in a comparator by a Titan yellow method. The original rough methods are rapidly being improved.
The results of the analysis of some hundreds of soils from the Kongwa area are summarised in the following table:
Table 6.-Summary of Results of Analysis of Main Soil Types, Kongwa Area, 1947-48
Plant foods extracted with 0.3N HCI for two minutes. pH by glass electrode or indicator
Soil type
Upland Pallid Soils
Red Soils
Valley Soils
Estimation
Per cent. of
Per cent. of
Per cent. of
No. of Samples
Total Red Soils
No. of Samples
Total
U.P. Soils
No. of Samples
Total
Valley Soils
Tested
Tested
Tested
I. pH
113
100
41
100
179
100
...
...
pH 4.0-4.5
2
2
1.
2
4.6-5.5
31
27
7
17
5.6-6.5
46
41
14
34
6.6-7.5
26
23
16
39
7.6-8.5
6
5
3
7
Over 8.5
1
142857
2
16
69
39
61
34
9
Mcdal range, pH
5.6-6.5
6.0-7.0
6.6-8.0
II. Phosphorus
63
100
27
100
142
100
P.mgm./100gm.-
Below 0.5 0.6-1.0 1.1-2.0
Over 2.0 Mean, mgm.
P/100gm.
III. Calcium
Ca.mgm./1CCgm.-
Below 25
26- 50
51-100
101-200
200-300
Over 300
Mean, mgm. Ca/100gm.
IV. Magnesium
Mg.mgm./100gm.-
Below 25
26-50
...
45
71
24
89
96
68
8
13
1
4
25
18
6
6
10
2
اب
8
7.
13
000000
6
1.0
1.4
0.9
109
100
41
100
177
100
...
...
1560
7
6
6
15
37
34
16
39
40
37
12
29
· 17
3
7
6
3
7
3
1970m
5
27
15
38
21
63
36
40
23
86
84
220
46
100
14
100
52
100
2
4
7
15
...
51-100.
25
54
...
101-150 Over 150
Mean, mgm.
Mg./100gm.
V. Potassium K.mgm./100gm.--
Below 4
5- 8
...
10
22
2
4
15011
7
36
5
57
36
10
1
10022
69
19
888
60
97
39
100
11
100
115
ICO
9-12
13-16
Over 16
K./100gm.
2
5
9
23
21
54
7
18
1000035
425
8
7
36
9
8
18
18
16
45
77
67
3
3
...
Mean, mgPage 358 of 1997
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Page 358
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