Effects of Phosphorous and Contamination of Lead and Zinc on Extraction Kinetics of the Available P, Pb and Zn in a Calcareous Soil under Waterlogged Conditions

Document Type : Research Paper

Authors

1 Ph.D student, Department of Soil Science, Faculty of Agriculture, University of Tabriz, Iran.

2 Associate Professor, Department of Soil Science, Faculty of Agriculture, University of Tabriz, Iran.

3 Professor, Department of Biochemistry, Faculty of Natural Sciences, University of Tabriz, Iran

Abstract

In order to evaluate the effects of phosphorus (P), contamination of lead (Pb) and zinc (Zn) and soil waterlogging on extraction kinetics of the available P, Zn and Pb in a calcareous soil, an experiment was conducted as factorial on the basis of completely randomized design with two replications under laboratory conditions with four factors consisting waterlogging duration at six levels  (0.1, 2, 6, 12, 36 and 72 days), Zn at two levels (0 and 250 mg kg−1 soil), P at two levels (0 and 500 mg kg−1 soil) and Pb at two levels (0 and 800 mg kg−1 soil). The extractable-P, Zn and Pb contents were measured at the end of each time by Soltanpour and Schwab method. The results showed that application of P, Zn and Pb increased the extractable-P, Zn and Pb, respectively. The extractable-P was significantly increased with increasing duration of waterlogging under no P fertilizer application whereas P application (500 mg kg−1 soil) resulted in reducing the average extractable-P by 23%. The extractable-Zn and Pb significantly decreased with increasing duration of waterlogging and application of P fertilizer, regardless of Zn and Pb applications. The results showed that in Pb and Zn contaminated soils, application of P fertilizer and soil waterlogging could decrease mobility and bioavailability of these heavy metals, leading to restrict their entrance in waters and plants.

Keywords

References

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Water and Soil Science
Volume 29, Issue 2
September 2019
Pages 29-42

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