Evaluation of Silicon Status in Gilan Paddy Soils

Document Type : Research Paper

Authors

1 Researcher, Rice Researcher Institute

2 Assistant Prof. School

3 Sciences Gilan University

4 Researcher; and experts, Rice Research Institute, respectively

Abstract

Although silicon (Si) is found at much higher concentrations than phosphorus and potassium in healthy rice crops and temperate paddy soils, it has received less attention. In order to evaluate the level of available silicon in Gilan paddy soils, one hundred and nine surface soil samples were collected. The soils had a uniform geographic distribution and the variables of pH, organic carbon, cation exchange capacity, water- soluble Si and Si extracted by molar sodium acetate at pH4 (NaOAc, pH=4) were measured in all the samples. Water-soluble Si had a normal frequency distribution. The range and mean values of water- soluble Si and Si extracted by acetate (NaOAc, pH=4) were more than critical limits proposed, (6 mg/kg for water- soluble Si) and 40 mg/kg for Si (NaOAc, pH=4). Correlation coefficients between variables of pH, O.C, silt and sand with water- soluble Si were low and non- significant. Correlation coefficient between the variables clay and cation exchange capacity with water -soluble Si, were higher and significant (r =0.5* and r =0.44*). Silicon extraction by 0.02M CaCl2 was found to lie in the range of 3.7 to 20.8 mg.kg-1 and was intermediate between the solubility of quartz and amorphous silica. West of Gilan and Sepeedrood catchments were found to have relatively more water soluble Si. In Foomanat region such values were less than those of any other region. These trends were similar to clay contents distributions in this region. In Sepeed rood catchments due to vehicle transportation and deposition of clay particles by river and irrigation systems, high clay contents were seen. The clay contents of west Gilan were also high due to alluvial deposition.  Aluminusilicate minerals dominate these clay fractions that can attain equilibrium with high levels of Si in soil solution. Foomanat region soils, formed on ancient coastal and river alluvial depositions, have low clay contents that attain equilibrium with low levels of Si in soil solution.

Keywords

References

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Iranian Journal of Soil Research
Volume 19, Issue 1
May 2005
Pages 43-51

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