Paul and Mukhopadhyay
Table 1. Physico-chemical properties (mean value) of experimental soils
Oxalate
CBD-
CBD-
Soil
Soil Series/
CEC
pH
OC
Total N
Clay
Silt+Clay
Benchmark
[cmol(+)
extract (%) extract (%) Al+Fe
No.
(1:2.5) (%)
(%)
(%)
(%) Al
Site
kg -1 ]
Fe
Al
Fe
(%)
X 1
X 2
X 3
X 4
X 5
X 6
X 7
X 8
X 9
X 10
X 11
CoochBehar district
1
Lotafela
5.56
0.86
0.12
7.64
17.27
36.27
0.12
0.14
0.19
0.20
0.39
2
Balorampur
5.21
1.14
0.15
7.52
17.30
40.63
0.07
0.08
0.06
0.11
0.16
3
Rajpur
4.93
0.81
0.09
6.83
14.50
34.10
0.20
0.22
0.27
0.35
0.62
4
Pundibari
5.92
1.03
0.16
7.42
14.56
38.46
0.08
0.11
0.08
0.14
0.22
5
Matiarkuthi
4.88
0.77
0.12
7.33
13.92
30.23
0.16
0.19
0.27
0.22
0.49
Jalpaiguri district
6
Berubari
4.83
1.71
0.19
8.06
14.84
34.34
0.31
0.28
0.40
0.44
0.84
7
Binnaguri
4.50
1.99
0.19
7.82
13.99
33.69
0.34
0.40
0.60
0.60
1.20
8
Moinaguri
5.26
1.23
0.17
7.55
15.76
36.86
0.09
0.15
0.12
0.20
0.32
9
Dhupguri
5.68
1.02
0.16
8.60
17.07
39.97
0.07
0.12
0.07
0.20
0.27
Darjeeling district
10
Kharibari
5.71
1.10
0.14
7.47
14.54
35.34
0.11
0.22
0.20
0.36
0.56
North Dinajpur district
11
Islampur
5.55
0.81
0.13
6.95
16.02
39.52
0.08
0.13
0.08
0.18
0.25
4.16-
0.40-
0.06-
3.65-
10.60-
22.72-
0.01- 0.02- 0.02- 0.04- 0.06-
Range
6.50
2.42
0.26
12.58
23.96
52.72
0.81
0.76
1.16
0.81
2.13
Mean
5.28
1.13
0.15
7.56
15.43
36.31
0.15
0.18
0.21
0.27
0.48
assessingȱ theȱ sulphurȱ availabilityȱ inȱ soils.ȱ Keepingȱ 1965),ȱCitrateȱbicarbonateȱDithioniteȱ-ȱextractableȱAlȱ
theseȱ views,ȱ attemptsȱ wereȱ madeȱ toȱ evaluateȱ theȱ andȱ Feȱ andȱ ammoniumȱ oxalateȱ extractableȱAlȱ andȱ
availableȱ sulphurȱ statusȱ andȱ differentȱ importantȱ Feȱ (Pageȱ et al. ȱ 1982)ȱ wereȱ determined.ȱAvailableȱ Sȱ
soilȱphysico-chemicalȱcharacteristicsȱtoȱelucidateȱtheȱ wasȱextractedȱbyȱusingȱ0.15%ȱCaCl 2 ȱ(Williamsȱandȱ
influencesȱ ofȱ theseȱ attributesȱ onȱ theȱ availabilityȱ ofȱ Steinbergsȱ1959).ȱTotalȱS,ȱorganicȱS,ȱadsorbedȱS,ȱheatȱ
sulphur.
solubleȱSȱandȱwaterȱsolubleȱSȱwereȱextractedȱbyȱusingȱ
theȱ methodsȱ ofȱ Tabatabaiȱ (1982),ȱ Foxȱ et al. ȱ (1964),ȱ
Materials and Methods
Foxȱ et al. ȱ (1964),ȱ Williamsȱ andȱ Steinbergsȱ (1959)ȱ
Oneȱ hundredȱ andȱ tenȱ (110)ȱ representativeȱ surfaceȱ
andȱ Spencerȱ andȱ Freneyȱ (1960),ȱ respectively.ȱ Theȱ
(0–15ȱcm)ȱsoilȱsamplesȱfromȱtypicalȱriceȱandȱmustardȱ
meanȱ valueȱ ofȱ eachȱ parameterȱ andȱ theȱ correlationȱ
growingȱfieldsȱspreadȱallȱoverȱtheȱareasȱrepresentingȱ
coefficientsȱbetweenȱavailableȱsulphurȱandȱdifferentȱ
someȱ terai ȱ soilȱ underȱ subtropicalȱ zoneȱ ofȱ Easternȱ
soilȱcharacteristicsȱwereȱcalculatedȱasȱperȱprocedureȱ
Indiaȱ wereȱ collectedȱ forȱ thisȱ study.ȱ Theȱ processedȱ
referredȱ inȱ Gomezȱ andȱ Gomezȱ (1983).ȱ Stepwiseȱ
soilȱ samplesȱ wereȱ analysedȱ forȱ physicochemicalȱ
regressionȱ equationsȱ wereȱ establishedȱ byȱ Karlȱ
propertiesȱ likeȱ pH,ȱ organicȱ carbon,ȱ CEC,ȱ totalȱ
PearsonȱmethodȱasȱdescribedȱinȱGomezȱandȱGomezȱ
nitrogenȱ byȱ standardȱ methods.ȱ Clayȱ andȱ siltȱ (Dayȱ
(1983).
348