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) Dämmgen , U. , Walker , P. , Grünhale , L. , Jäger , H.J. 1998 . The Atmospheric Sulphur Cycle. Sulphur in Agroecosystems . Kluwer Academic Publishers, Dordrecht , Netherlands , pp. 75 – 114

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Aulakh, M. S., Pasricha, N. S. (1979): Responses of gram (Cicer arietinum L.) and lentil (Lens culinaris L.) to phosphorus as influenced by applied sulphur and its residual effect on moong (Phaseolus aureus L

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Altaf, A., Ishrat, K., Abdin, M., Ahmad, A. & Khan, I. (2000): Effect of sulphur fertilization on oil accumulation, acetyl-CoA concentration, and acetyl-CoA carboxylase activity in the developing seeds of rapeseed ( Brassica campestris L.). Aust. J

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Abstract  

The influence of oxidation of coal, performed with different oxidising agents, on the sulphur species was studied. Conversions of the sulphur species were investigated by the Atmospheric Pressure-Temperature Programmed Reduction method (AP-TPR). The removal of pyrite proved to be advantageous for AP-TPR analysis. It was found that non-thiophene sulphur species undergo easier oxidation by different agent then thiophenic structures.

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Use of high analysis fertilizers such as diammonium phosphate in place of ordinary superphosphate and urea in place of ammonium sulphate over years, sulphur application to crop fields has considerably decreased, which has led to widespread sulphur deficiency in Indian soils. Hence, considering this into account a field study for two years was conducted at the research farm of ICAR-Indian Agricultural Research Institute, New Delhi to evaluate sulphur-coated urea (SCU) as a source of sulphur (S) and an enhanced efficiency of nitrogen fertilizer. Prilled urea (PU) coated with 4 to 5% S significantly increased wheat grain yield to the tune of 9.58 to 11.21% and nitrogen 19.06 to 23.94% and sulphur uptake 21.76 to 29.29% over prilled urea alone by wheat. However, net return and benefit: cost ratio was the highest and significant at 5% S coating onto PU. Five % SCU supplied 50% of the sulphur needs of the wheat crop and enhanced nitrogen recovery efficiency by 60% and is therefore recommended as sulphur as well as enhanced efficiency of nitrogen fertilizer for wheat in Indo-Gangetic plains of India. This is an important finding considering the environmental safety by increased nitrogen recovery and also productivity in present scenario.

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FO Simon 1983 Sulfur diagenesis in Everglades peat and origin of pyrite in coal Science 221 221 227

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method for phosphorous pentasulfide elemental sulfur analysis is labor intensive and not easily reproduced. Suppliers now react ∼10 grams of phosphorous pentasulfide with excess methanol. This is followed by a low temperature precipitation step

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different sources of sulphur (S) at various levels and its residual effect on wheat in rice-wheat cropping system. Soil Environ. , 27 , 131–137. Khattak R. A. Response of rice to

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Abstract  

Thermal analysis of sulfurization of polyacrylonitrile (PAN) with elemental sulfur was investigated by thermogravimetry and differential thermal analysis of the mixture of polyacrylonitrile and elemental sulfur up to 600°C. Due to the volatilization of sulfur, the different heating rate (10 and 20 K min−1) and different mixture proportion of polyacrylonitrile and elemental sulfur were adopted to run the analysis. The different heating rates make the DSC curves of sulfur different, but make the DSC curves of PAN similar. In the DSC curve of sulfur for the heating rate of 20 K min−1 around 400°C, a small exothermic peak occurs at 400°C in the wide endothermic peak around 380∼420°C, indicative of that there is an exothermic reaction around 400°C. In the DSC curves of the mixture, the peaks around 320°C are exothermic as the content of sulfur is below 3.5:1 and endothermic as the content of sulfur is over 4:1, indicating that one of the reactions between PAN and sulfur takes place around 320°C. In the TG curves of the mixture, the mass losses begin at 220°C, and sharply drop down from 280°C. The curves for the low sulfur content obviously show two steps of mass loss, and curves for the high sulfur content show only one step of mass loss, indicative of more sulfur is benefit for the complete sulfurization of PAN. This study demonstrates that the TG/DSC analysis can give the parameter for the sulfurization, even if the starting mixture contains the volatile sulfur.

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. 3. Bolton , J. – Nowakowski , T. Z. – Lazarus , W. : 1976 . Sulphur-nitrogen interaction effects on the yield and composition of protein-N non-protein-N and soluble carbohydrates in perennial ryegrass, Journal of

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