|
Table 4. Physico chemical characteristics of soils
where cassava is cultivated in India
|
Contents
Parameter
Contents
|
Unit |
|
Kerala
|
Tamil Nadu
|
Andhra Pradesh
|
|
Ultisols
|
Vertisols
|
Alfisols
|
Inceptisols
|
|
Range
|
Mean
|
Range
|
Mean
|
Range
|
Mean
|
Range
|
Mean
|
|
pH
|
|
4.1-5.8
|
5.0
|
7.2-8.5
|
8.0
|
5.7-8.5
|
6.8
|
4.90-6.20
|
5.5
|
|
OC
|
%
|
0.31-2.70
|
1.08
|
0.48-1.11
|
0.70
|
0.16-0.71
|
0.38
|
0.15-0.53
|
0.35
|
|
Available N
|
kg /ha
|
165.20-300.15
|
174.23
|
87.36-189.30
|
123.80
|
107.25-268.13
|
168.70
|
94.52-128.89
|
106.55
|
|
Available P
|
kg /ha
|
15.61-39.62
|
28.94
|
16.64 - 92.70
|
41.35
|
1.57.82.77
|
19.82
|
16.78-74.98
|
54.60
|
|
Exchangeable K
|
kg /ha
|
60.43-174.20
|
98.28
|
60.50 -1050.00
|
439.30
|
78.4-705.0
|
298.12
|
82.63-96.71
|
86.24
|
|
Exchangeable Ca
|
cmol / kg
|
0.22-0.63
|
0.39
|
3.13-13.43
|
8.44
|
2.63-11.50
|
5.70
|
0.15-0.48
|
0.31
|
|
Exchangeable Mg
|
cmol / kg
|
0.02-0.08
|
0.06
|
1.38-3.50
|
2.42
|
0.14-1.13
|
0.78
|
0.02-0.05
|
0.03
|
|
Exchangeable S
|
mg / kg
|
3.47-9.55
|
6.51
|
-
|
-
|
-
|
-
|
-
|
-
|
|
Exchangeable Fe
|
mg / kg
|
5.98-82.90
|
19.43
|
1.82-33.40
|
9.84
|
0.60-3.83
|
1.80
|
0.69-2.57
|
1.89
|
|
Exchangeable Mn
|
mg / kg
|
2.48-84.76
|
19.90
|
1.09-20.43
|
6.85
|
0.50-5.60
|
1.50
|
0.41-1.75
|
0.93
|
|
Exchangeable Zn
|
mg / kg
|
0.26-1.96
|
0.78
|
0.37-2.71
|
0.83
|
0.50-4.60
|
1.10
|
0.88-2.43
|
1.65
|
|
Exchangeable Cu
|
mg / kg
|
0.24-10.20
|
1.24
|
0.95-4.53
|
2.68
|
1.69-4.66
|
2.80
|
0.59-1.29
|
0.86
|
|
Exchangeable B
|
mg / kg
|
0.02-0.40
|
0.27
|
0.61-0.95
|
0.82
|
0.16-0.29
|
0.22
|
0.26-0.35
|
0.31
|
|
CEC |
cmol(p+) / kg |
1.39-7.70 |
3.04 |
- |
- |
- |
- |
- |
- |
|
BD |
Mg m-3 |
1.30-1.60 |
1.40 |
1.18-1.27
|
1.23 |
1.03-1.22 |
1.18 |
1.24-1.39
|
1.34 |
|
Sand |
% |
32.10-65.80 |
53.70 |
24.75-38.50
|
33.69 |
22.61-36.48 |
31.21 |
90.50-95.90
|
93.80 |
|
Silt |
% |
3.10-8.40 |
5.20 |
21.30-32.30
|
28.09 |
23.65-33.31 |
29.27 |
1.70-4.10
|
3.70 |
|
Clay |
% |
26.30-62.50 |
42.00 |
29.25-54.00
|
38.96 |
28.72-47.61 |
39.53 |
1.50-3.00
|
2.50 |
|