Paul and Mukhopadhyay
Table: 7 Soil characteristics/properties predicting S
Y = -3.66 + 18.05X + 0.45X
2
6
availability using different indices (n = 110)
23
1
– 93.99X – 7.92X
3
8
Contribution
Y = -4.48 + 16.25X 2 +
Cumulative
of individual
0.45X 6 – 80.18X 3 – 12.30X 8
24
1
Regression equation
contribution
soil
+ 10.66X 7
(R 2 x 100)
characters
Y = 6.02 + 14.75X 2 + 0.49X 6
(R 2 x 100)
– 68.15X 3 – 12.37X 8 + 8.81X 7
25
1
Total S
- 2.20X 1
Y = 181.62 + 865.82X 3
25
25
Heat soluble S
Y = 75.37 + 786.14X 3 +
Y = 38.67 + 8.78X 2
11
11
33
8
7.65X 5
Y = 29.57 + 8.69X 2 +0.25X 6
13
2
Y = 59.27 + 754.99X 3 +
36
3
Y = 30.86 + 14.49X 2 +0.34X 6
15
2
7.98X 5 + 57.22X
10
– 74.84X 3
Y = -25.78 + 761.36X 3 +
37
1
Y = 33.97 + 14.8X 2 +0.36X 6
15
Fraction
7.31X 5 + 70.07X + 17.24X
10
1
– 69.52X 3 – 0.65X 4
Y = -55.67 + 497.24X 3 +
Water soluble S
7.56X 5 + 58.94X 10 + 23.39X 1
38
1
Y = 17.64 + 5.78X
10
5
5
+ 31.33X 2
Y = 17.67 + 11.93X –
10
Organic S
10
5
8.07X
9
Y = 157.36 + 778.31X 3
24
24
Y = 14.75 + 12.13X 10 –
12
2
Y = 59.53 + 704.95X 3 +
33
9
8.82X 9 + 20.55X 3
7.04X 5
Y = 8.09 + 11.97X 10 – 7.33X 9
13
1
Y = 40.59 + 679.91X 3 +
35
2
– 19.87X 3 + 1.23X 1
7.31X 5 + 45.95X 10
X pH
1 =
X 2 = OC
X 3 = Total N
Y = -53.33 + 687.42X 3 +
37
2
X 4 = CEC X 5 = Clay
X 6 = Silt + Clay
6.52X 5 + 61.06X 10 + 20.25X 1
X 7 = OX-Al X 8 = OX-Fe
X 9 = CBD-Al
Y = -32.19 + 699.77X 3 +
6.31X + 81.19X + 17.02X
X 10 = CBD- X 11 = CBD (Al
5
10
1
37
Fraction
Fe
+ Fe)
– 55.18X 7
Sulphate S
contentȱ ofȱ Sȱ inȱ thisȱ formȱ inȱ theȱ samplesȱ fromȱ
Y= 19.38+ 4.20X 2
11.4
11
Binnaguriȱseriesȱalongwithȱtheȱhighestȱmeanȱofȱ65.47ȱ
Y= 11.66+ 4.12X 2 + 0.22X 6
17
6
mgȱkg -1 ȱwasȱobserved.
Y= 10.79+ 3.43X 2 + 0.23X 6
19
2
+4.24X 10
Water soluble sulphur
Y= 11.58+ 3.91X 2 + 0.20X 6 +
21
2
WaterȱsolubleȱSȱcontentȱinȱexperimentalȱsoilsȱrangedȱ
8.46X 10 – 6.06X
9
fromȱ 9.40ȱ toȱ 36.09ȱ mgȱ kg -1 ȱ withȱ anȱ overallȱ meanȱ
Y= 13.63+ 4.44X 2 + 0.21X 6 +
22
1
valueȱofȱ19.22ȱmgȱkg -1 ȱsoilȱ(Tableȱ4)ȱandȱconstitutedȱ
8.38X 10 – 6.45X -0.39X
9
3
1.77ȱ toȱ 6.80ȱ perȱ centȱ alongwithȱ itsȱ averageȱ ofȱ 6.2ȱ
Y= 13.78+ 4.33X 2 + 0.20X
6
perȱcentȱ(Figureȱ1)ȱofȱtheȱtotalȱSȱandȱKharibariȱsitesȱ
– 404.89X 10
– 419.62X
9
23
1
-0.37X 3 – 413.18X 11
ofȱ Darjeelingȱ districtȱ containedȱ relativelyȱ higher.ȱ
Adsorbed S
Resultsȱ furtherȱ showedȱthatȱ waterȱsolubleȱSȱstatusȱ
inȱ theseȱ soilsȱ recordedȱ higherȱ valueȱ (meanȱ 19.22ȱ
Y = 6.58 + 10.03X 2
16
16
mgȱ kg -1 )ȱ thanȱ theȱ adsorbedȱ Sȱ (meanȱ 17.94ȱ mgȱ
Y = -6.65 + 9.89X 2 + 0.37X
6
19
3
kg -1 ),ȱ butȱ itȱ wasȱ lowerȱ thanȱ sulphateȱ Sȱ contentȱ
Y = -5.17 + 16.55X 2 + 0.47X
6
22
3
(meanȱ 24.14ȱ mgȱ kg -1 )ȱ inȱ allȱ theȱ samplesȱ studied.ȱ
– 85.9X 3
354