Effects of organic matter on sulphur oxidation in soil and influence of sulphur oxidation on soil nitrification |
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Authors: | M Wainwright Wendy Nevell Susan J Grayston |
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Institution: | (1) Department of Microbiology, University of Sheffield, S10 2TN Sheffield, UK |
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Abstract: | Summary The effects of wheat straw and pressed sugar beet pulp on sulphur oxidation were determined in a loam soil amended with 1%
(w/w) elemental sulphur. Wheat straw stimulated the oxidation of elemental sulphur over the first 2 to 3 weeks of the incubation
period, resulting in an increase in LiCl-extractable sulphate. After 4 to 7 weeks incubation however, the only significant
increase in soil sulphate followed the 1% straw addition, while at week 7 sulphate concentrations in the 0.25% and 5.0% straw
amended soils were lower than the control.
Pressed sugar beet pulp (1% w/w) initially stimulated the oxidation of elemental sulphur in the soil, but by weeks 3 to 7
of the incubation period rates of oxidation in pulp-amended soils were lower than the control. Towards the end of the incubation
period however, sulphate concentrations in the amended soils exceeded the control values, significantly so by week 11. The
concentration of thiosulphate and tetrathionate also increased in soils receiving sugar beet pulp.
Nitrification was inhibited in soils in which sulphur oxidation was actively occurring. Although possible alternatives are
mentioned, such inhibition appears to result from a decrease in soil pH brought about by the oxidation of elemental sulphur
to sulphuric acid. |
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Keywords: | Nitrification Organic matter Sulphur cycle Sulphur oxidation |
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