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Asian Journal of Plant Sciences
Year: 2004  |  Volume: 3  |  Issue: 4  |  Page No.: 480 - 483

Evaluation of Extractants and Critical Limits of Sulphur in Rice Soils of Bangladesh

M.N. Huda, M.R. Islam and M. Jahiruddin    

Abstract: An investigation was undertaken to evaluate suitable extractant(s) for available sulphur and critical limits of sulphur for wetland rice soils of Bangladesh. Some 22 soils from 0-15 cm depth were collected from different locations of Old Brahmaputra Floodplains of the country. Sulphur in the soils was extracted with four different extractants, MCP (500 ppm P), CaCl2 (0.15%), NH4OAc (0.5 M) and NaHCO3 (0.5 M). Rice plants were grown in pots treated with and without S for eight weeks. At harvest dry matter of rice was recorded. The critical level of S was determined by both graphical and statistical methods. The extractable S of the soils varied considerably with the soils and the extractants used. The ability of the extractants to extract S followed the order: 0.5 M NH4OAc > 0.5 M NaHCO3, >0.15% CaCl2 > MCP. The MCP extractable S showed significant and positive correlation with organic matter, available P and exchangeable K contents but was significantly and negatively correlated with soil pH. The amount of extractable S by other methods did not show any significant correlation with soil properties. The extractable S by any pair of extractants viz., CaCl2 vs NH4oAc, CaCl2 vs NaHCO3 and NH4oAc vs NaHCO3 were significantly and positively correlated. The critical levels of MCP, CaCl2, NaHCO3 and NH4OAc extractable S were 9.3, 9.7, 15.8 and 17.8 mg kg-1, respectively in both graphical and statistical methods for rice. The critical limit for plant S was found to be 0.12% at 56 days of crop growth.

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