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Volume 6, Issue 6, December Issue - 2018, Pages:983-989

Authors: Ashish Rai, Surendra Singh
Abstract: Information regarding sulphur (S) distribution in black soils of Varanasi district is meager. Therefore, present study was undertaken to assess the different forms of sulphur in black soils of Varanasi district, for this, 100 soil (0-15 cm depth) samples were collected by using global positioning system (GPS) from the Shahanshahpur village, Araziline block of Varanasi district, Uttar Pradesh.  Analysis of soil samples revealed the presence of extractable sulphur (SO4-S) in soils which ranged (mean) from 7 to 33 mg S kg-1 (15 mg S kg-1) soil. The distribution pattern of sulphur was in the order of organic sulphur (40%) >non sulphate sulphur (30%)> adsorbed sulphur (16%) >heat soluble sulphur (11%)> 0.15% extractable available sulphur (3%). Perusal of the data shows positive and significant correlation between total sulphur, organic sulphur (r = 0.987), non sulphate sulphur (r= 0.601**) and heat soluble S (r= 0.803). Heat soluble S was also positively and significantly correlated with total S (r= 0.803**), organic sulphur (r= 0.764**) and non sulphate sulphur (r= 0.619**). The significant correlation amongst different forms of sulphur suggested an interrelated dynamic equilibrium in soils. Inferences drawn from the study on sulphur revealed that organic sulphur was determining factor in association with almost all the fractions of sulphur. Hence, organic matter thought to be good S-reservoir in these soils.
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