Availability of zinc in the rhizosphere of corn in texturally different contaminated soils treated with chelators

Document Type : Complete scientific research article

Authors

shahrekord univecsity

Abstract

Abstract
Background and objectives: Rhizosphere processes have a major impact on zinc (Zn) availability in soils. The chemical and biological characteristics of the rhizosphere soils can be very different from those of the bulk soils. In peresent study, the effects of EDTA, citric acid and poultry manure extract (PME) on availability of Zn in the rhizosphere of corn (hybrid (KSC.704)) investigated in two texturally different contaminated soils as factoriel in a completely randomized design with three replications in greenhouse condition.
Materials and methods: Citric acid and EDTA were used at concentrations level 0, 0.5 and 1 mmol kg-1 soil and poultry manure extract at concentrations level 0, 0.5 and 1 g kg-1 soil. Three seeds of corn were plant in the rhizobox. After 10 weeks, plants were harvested and rhizosphere and bulk soils were separated. Dissolved organic carbon (DOC), microbial biomass carbon (MBC) and available Zn (by using 4 chemical procedures including DTPA-TEA, AB-DTPA, Mehlich3 and rhizosphere-based method) were determined in the rhizosphere and bulk soils.
Results: Rhizosphere soils properties was different with bulk soils. In both soils, the results indicated that DOC and MBC in the rhizosphere were significantly (p < 0.05) increased, while, pH in the rhizosphere was significantly (p < 0.05) decreased comare to bulk soils. In both soils, Zn extracted by different methods in the rhizosphere were significantly (p < 0.05) lower than those in the bulk soils. Amount of exteracted Zn with extractants ranged from 9.00 to 75.00 mg kg-1 in sandy loam soil, and 0.78 to 75.00 mg kg-1 in sandy loam soil. The maximum amount of Zn by mehlich3 and the least amount of Zn by rhizosphere based method were exteracted. Available Zn increased as added chelators to soil.
Conclusion: In both soils, Zn extracted by different methods in the rhizosphere were significantly (p < 0.05) lower than those in the bulk soils. In sandy loam soil, The maximum amount of Zn in the citric acid treatment (1 mmol kg-1) and the least amount of Zn in control condition, were exteracted, while, In clay loam soil, The maximum amount of Zn in the EDTA treatment (1 mmol kg-1) and the least amount of Zn in the PME treatment (1 g kg-1), were exteracted. Mean of Zn extracted by DTPA-TEA, AB-DTPA, Mehlich3, in clay loam soil was significantly (p < 0.05) higher than those in sandy loam soil. Mean of Zn extracted by rhizosphere-based method in sandy loam soil was significantly (p < 0.05) lower than those in clay loam soil.

Keywords

References

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Journal of Water and Soil Conservation
Volume 25, Issue 2
May and June 2018
Pages 187-202

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