Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2003 , Volume 17 , Number 1; Page(s) 68 To 79.
 
Paper: 

EVALUATION OF SULFUR OXIDATION POTENTIAL BY HETEROTROPHIC MICROORGANISMS IN SIFFERENT SOILS

 
 
Author(s):  KARIMINIA AMINA, SHAABAN POUR M.
 
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Abstract: 
The chemical oxidation of sulfur in soils is generally very slow. The activity of some soil microorganisms enhances the oxidation of sulfur, which results in pH reduction. A wide spectrum of microorganisms are capable of oxidizing sulfur in the soil environment. In a number of studies and reviews, it has been suggested that heterotrophs play an important role potential by heterotrophic microorganisms and their effects on pH reduction of different soils. Soil samples with different TNV values and organic matter contents from agricultural areas of Gilan province, were collected, sieved (2 mm) and incubated in one kg polyethylene bags at 60% of FC and 20-30 °C. Laboratory studies were performed based on Completely Randomized Design (CRD) in a factorial experiment with 30 treatments in 3 replications. The treatments consisted of three levels of sulfur (s__0=0%, s__1=0.2% and s__2=0.4%), two levels pH and electrical conductivity. Results showed that elemental sulfur lowered the pH values of some soils by 0.2 units after incubation for 80 days. In soils number 3 and 4, the addition of glucose with sulfur significantly stimulated sulfur oxidation and pH reduction in comparison with the same treatment without glucose, while in soils number 1, 2 and 5 the effect of glucose on soil pH was not significant. Addition of glucose to soils amended with sulfur, significantly decreased soil EC levels compared with soils amended just with sulfur. It can be concluded that the addition of 0.2 % sulfur can reduce the pH in some soils while in some other soils organic substrate should also be added along with sulfur.
 
Keyword(s): SULFUR, PH, OXIDATION
 
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