243
Table 8.1 Organic matter and nutrient status of island soils
Parameter
Prentice
range
Average
Lothian
range
Average
Harinbari
range
Average
Sagar
range
Average
Organic matter:
Organic carbon
(%)
0.45–
0.69
0.55
0.99–
1.86
1.31
0.29–0.56 0.39
0.26–0.72 0.45
Humus carbon
(%)
0.07–
0.19
0.15
0.30–
0.13
0.43
0.09–0.16 0.12
0.09–0.21 0.015
Humic acid
carbon (%)
0.01–
0.90
0.04
0.09–
0.29
0.17
0.03–0.06 0.04
0.01–0.05 0.03
Fulvic acid
carbon (%)
0.07–
0.13
0.09
0.14–
0.44
0..26
0.45–0.11 0.08
0.07–0.16 0.11
Carbon (%)
HA-C/FA-C
0.14–
0.90
0.47
0.42–
1.71
0.73
0.40–0.86 0.59
0.11–0.56 0.33
Nitrogen
Available N
(me/100 g)
0.61–
0.01
0.78
0.64–
0.83
0.75
0.29–0.67 0.44
0.42–0.84 065
NH 4 -N
(me/100 g)
0.23–
0.36
0.30
0.27–
0.34
0.31
0.16–0.29 0.21
0.21–0.30 0.26
NO 3 -N
(me/100 g)
0.09–
0.30
0.19
0.16–
0.24
0.20
Trace- 0.14 0.07
Trace- 0.26 0.14
Total N
(me/100 g)
3.57–
5.00
4.05
4.29–
5.71
4.88
3.57–5.00 4.05
2.85–5.71 4.05
Phosphorus
Available P
(ppm)
26–41
33.2
30–49
41.2
50–71
62.7
38–76
54.5
Ca-P (ppm)
180–249 211.4
145–173 159.5
251–316
291.9
323–371
354.9
Fe –P (ppm)
44–67
55.7
76–102 91.6
27–40
36.7
17–29
24.8
Total P (ppm) 459–541 501.0
499–601 554.2
550–609
585.3
611–646
631.2
Potassium
Exchangeable
k (me/100 g)
1.46–
2.61
1.91
3.05–
3.56
3.36
1.75–1.90 1.83
0.62–1.78 1.44
Water soluble
K (me/100 g)
0.79–
0.85
0.83
1.61–
1.74
1.68
0.27–0.31 0.29
0.27–0.30 0.29
Fixed K
(me/100 g)
12.28–
13.78
12.95
15.32–
16.05
15.8
15.61–
18.45
17.28
7.85–
18.92
14.60
Lattice K
(me/100 g)
46.29–
72.82
59.96
45.65–
55.90
51.82
49.23–
52.23
50.69
50.26–
63.07
56.98
Total K
61.45–
89.74
75.64
66.67–
76.92
72.65
69.23–
71.79
70.08
64.10–
80.77
73.29
Sulphur
SO 4 − S (ppm) 415–465 440.5
1090–
1245
1167.2
297–365
333.9
232–301
276.2
Organic − S
(ppm)
98–130 112.7
392–461 431.5
98–138
121.6
61–110
89.3
Total S (ppm) 659–727 659.9
1677–
1797
1731.7
559–630
598.2
426–538
491.0
Zn (ppm)
1.7–14.0 9.2
2.5–10.8 6.7
1.66–4.5
2.8
2.5–4.8
3.3
(continued)
8 Mangroves: A Reservoir of Biodiversity
Table 8.1 Organic matter and nutrient status of island soils
Parameter
Prentice
range
Average
Lothian
range
Average
Harinbari
range
Average
Sagar
range
Average
Organic matter:
Organic carbon
(%)
0.45–
0.69
0.55
0.99–
1.86
1.31
0.29–0.56 0.39
0.26–0.72 0.45
Humus carbon
(%)
0.07–
0.19
0.15
0.30–
0.13
0.43
0.09–0.16 0.12
0.09–0.21 0.015
Humic acid
carbon (%)
0.01–
0.90
0.04
0.09–
0.29
0.17
0.03–0.06 0.04
0.01–0.05 0.03
Fulvic acid
carbon (%)
0.07–
0.13
0.09
0.14–
0.44
0..26
0.45–0.11 0.08
0.07–0.16 0.11
Carbon (%)
HA-C/FA-C
0.14–
0.90
0.47
0.42–
1.71
0.73
0.40–0.86 0.59
0.11–0.56 0.33
Nitrogen
Available N
(me/100 g)
0.61–
0.01
0.78
0.64–
0.83
0.75
0.29–0.67 0.44
0.42–0.84 065
NH 4 -N
(me/100 g)
0.23–
0.36
0.30
0.27–
0.34
0.31
0.16–0.29 0.21
0.21–0.30 0.26
NO 3 -N
(me/100 g)
0.09–
0.30
0.19
0.16–
0.24
0.20
Trace- 0.14 0.07
Trace- 0.26 0.14
Total N
(me/100 g)
3.57–
5.00
4.05
4.29–
5.71
4.88
3.57–5.00 4.05
2.85–5.71 4.05
Phosphorus
Available P
(ppm)
26–41
33.2
30–49
41.2
50–71
62.7
38–76
54.5
Ca-P (ppm)
180–249 211.4
145–173 159.5
251–316
291.9
323–371
354.9
Fe –P (ppm)
44–67
55.7
76–102 91.6
27–40
36.7
17–29
24.8
Total P (ppm) 459–541 501.0
499–601 554.2
550–609
585.3
611–646
631.2
Potassium
Exchangeable
k (me/100 g)
1.46–
2.61
1.91
3.05–
3.56
3.36
1.75–1.90 1.83
0.62–1.78 1.44
Water soluble
K (me/100 g)
0.79–
0.85
0.83
1.61–
1.74
1.68
0.27–0.31 0.29
0.27–0.30 0.29
Fixed K
(me/100 g)
12.28–
13.78
12.95
15.32–
16.05
15.8
15.61–
18.45
17.28
7.85–
18.92
14.60
Lattice K
(me/100 g)
46.29–
72.82
59.96
45.65–
55.90
51.82
49.23–
52.23
50.69
50.26–
63.07
56.98
Total K
61.45–
89.74
75.64
66.67–
76.92
72.65
69.23–
71.79
70.08
64.10–
80.77
73.29
Sulphur
SO 4 − S (ppm) 415–465 440.5
1090–
1245
1167.2
297–365
333.9
232–301
276.2
Organic − S
(ppm)
98–130 112.7
392–461 431.5
98–138
121.6
61–110
89.3
Total S (ppm) 659–727 659.9
1677–
1797
1731.7
559–630
598.2
426–538
491.0
Zn (ppm)
1.7–14.0 9.2
2.5–10.8 6.7
1.66–4.5
2.8
2.5–4.8
3.3
(continued)
8 Mangroves: A Reservoir of Biodiversity