Paul and Mukhopadhyay
Table 5. Relationship of different forms of sulphur with various salient characteristics of soil
Forms of S Parameter
Total S
Organic S
Sulphate S
Adsorbed S
Heat Soluble S
Water Soluble S
pH
0.09
0.13
-0.02
-0.20*
-0.17
0.08
OC
0.44**
0.40**
0.34**
0.40**
0.33**
0.15
Total N
0.50**
0.50**
0.27**
0.26**
0.21*
0.15
CEC
0.21*
0.21*
0.04
0.08
0.03
0.04
Clay
0.36**
0.36**
0.19*
0.14
0.11
0.11
Silt + Clay
0.33**
0.32**
0.24*
0.20*
0.13
0.15
Oxalate-Al
0.05
0.02
0.10
0.21*
0.15
0.01
Oxalate-Fe
0.17
0.17
0.19*
0.04
0.09
0.19*
CBD-Al
0.10
0.08
0.10
0.16
0.16
0.04
CBD-Fe
0.20*
0.18
0.24*
0.12
0.21*
0.23*
CBD-(Al+Fe)
0.16
0.13
0.18
0.15
0.20*
0.14
* and ** : refer to significant level at 0.05 and 0.01 respectively.
Table: 6 Correlations (r-value) amongst different forms of sulphur in experimental soils (n = 110)
Forms of S
Total S
Organic S
Sulphate S
Adsorbed S
Heat soluble S
Total S
-
Organic S
0.99**
-
Sulphate S
0.77**
0.70**
-
Adsorbed S
0.37**
0.24*
0.46**
-
Heat soluble S
0.50**
0.38**
0.70**
0.82**
-
Water soluble S
0.61**
0.60**
0.80**
-0.03
0.38**
* and **: refer to significance at 0.05 and 0.01 levels respectively.
Sȱisȱconsistedȱinȱtheȱorganicȱmatter,ȱveryȱlowȱorganicȱ consideredȱ inȱ thisȱ study.ȱ Whileȱ soilȱ samplesȱ fromȱ
carbonȱ (0.40%)ȱ contentȱ inȱ formerȱ asȱ againstȱ veryȱ Binnaguriȱ series,ȱ inȱ general,ȱ recordedȱ toȱ haveȱ
highȱ amountȱ (2.42%)ȱ inȱ theȱ latterȱ oneȱ mightȱ haveȱ considerablyȱhigherȱtotalȱSȱ(227.17ȱtoȱ530.40)ȱwithȱitsȱ
contributedȱtoȱsuchȱspectacularȱvariationȱinȱtotalȱSȱ meanȱofȱ372.07ȱmgȱkg -1 ,ȱwhichȱappearedȱtoȱbeȱtheȱ
contentȱ(JatȱandȱYadavȱ2006).
highestȱ amongstȱ allȱ soilȱ locationsȱ studied.ȱ Allȱ theȱ
DistributionȱofȱtotalȱSȱccordingȱtoȱlocationsȱrevealedȱ
samplesȱ fromȱ theȱ plainȱ areasȱ ofȱ Darjeelingȱ districtȱ
(Tableȱ 4)ȱ thatȱ samplesȱ belongedȱ toȱ Rajpurȱ seriesȱ
shownȱ toȱ containȱ higherȱ amountȱ ofȱ totalȱ Sȱ andȱ
underȱCoochbeharȱdistrictȱcontainedȱtotalȱSȱ(195.42ȱ
itȱ wasȱ followedȱ byȱ thoseȱ fromȱ Jalpaiguriȱ district;ȱ
toȱ 289.67)ȱ withȱ itsȱ meanȱ valueȱ ofȱ 233.83ȱ mgȱ kg -1 ,ȱ
whereasȱsamplesȱtestedȱfromȱCoochBeharȱandȱNorthȱ
beingȱ theȱ lowestȱ amongstȱ theȱ differentȱ locationsȱ
Dinajpurȱdistrictȱrecordedȱtoȱfollowȱaȱsimilarȱtrendȱ
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