Applying Multicropping System to Phytoremediate Cadmium Contaminated Soils by Using Natural and Synthetic Chelates

Document Type : مقاله کوتاه

Authors

Faculty of Agriculture, Tarbiat Modares University, Tehran

Abstract

Soil contamination is one of the most recent and important environmental challenges worldwide. The so-called phytoremediation is one of the reclamation technologies used to decontaminate polluted soils. Application of some chelate agents can increase the efficiency of phytoremediation. However, this technology has not been evaluated for decontamination of heavy metals under multicropping system. The objective of this study was to evaluate the phytoremediation capability of cress and radish, as a mixed-culture by using some natural and synthetic chelates in Cd-contaminated soils. Consequently, a factorial experiment in a completely randomized design with 20 treatments and three replications was conducted. The experimental factors were consisted of five levels of cadmium (0, 3, 10, 25, 50 mg Cd kg-1 soil, added as Cd(NO3)2, EDTA and NTA chelates, and chelate concentrations of 1 and 2.5 mmol kg-1 soil. Results indicated that the Cd phytoextraction potential in multicropping culture is higher than the single-cropping system. Phytoextraction of cadmium from contaminated soils for both cress and radish plants, in EDTA2.5 and Cd50 treatments was 7.7 and 5.7 kg Cd ha-1 in multicropping system and was 4 and 5.4 kg Cd ha-1 in the single-cropping system. Furthermore, radish could phytoextract more cadmium than cress from the contaminated soils. The results further indicated that EDTA could enhance more Cd phytoextraction than NTA and can better assist to transfer cadmium from roots to shoots.

Keywords

References

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Environmental Sciences
Volume 13, Issue 2
July 2015
Pages 75-88

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