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Green manure effects on zinc and cadmium accumulation in wheat grains (Triticum aestivum L.) on high and low zinc soils

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Abstract

Background and aims

Zinc (Zn) deficiency is a global problem in human nutrition due to imbalanced diets based on staple foods of low Zn contents. This study investigated the potential of using clover (Trifolium alexandrinum L.) and mustard (Sinapis alba L.) green manure crops to increase soil Zn uptake by wheat (Trifolium aestivum L.) without enhancing cadmium (Cd) accumulation.

Methods

A factorial pot experiment with wheat was performed with three green manure treatments (clover, mustard or no green manure) and three soil treatments which were a high-Zn soil (FYM), a low-Zn soil (TURK) and the TURK soil with mineral Zn fertilization (TURK+ZN). Green manure crops were grown first and then incorporated into the soils before wheat.

Results

In contrast to mustard, clover increased grain Zn concentrations in the FYM and TURK+ZN soils, but not in the TURK soil. The effect appeared to be due to high soil nitrogen inputs and concurrent pH decrease, root biomass increase, and the release of organic ligands mobilizing soil Zn and Cd. However, the high N inputs also induced Cd accumulation above critical thresholds.

Conclusions

The study suggests that on Zn sufficient soils or in combination with Zn fertilizer, leguminous green manure can increase soil Zn accumulation by wheat.

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Abbreviations

DOC:

Dissolved organic carbon

DTPA:

Diethylenetriamine pentaacetic acid

FLOW:

Wheat flowering

FYM:

Zn sufficient soil from the farmyard manure treatment of the Swiss long-term trial ZOFE

NGM:

Control treatment without green manure

PLA:

Wheat planting

SIN:

Sinapis alba L. (white mustard)

TFAA:

Total free amino acids

TRI:

Trifolium alexandrinum L. (berseem clover)

TURK:

Zn deficient soil from Central Anatolia in Turkey

TURK + ZN:

Zn deficient soil from Central Anatolia (Turkey) fertilized with 5 mg kg−1 Zn

References

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Acknowledgements

We thank Ismail Cakmak (Sabanci University, Istanbul) and Jochen Mayer (Agroscope, Zurich) for providing the soils, Benjamin Costerousse and Samuel Ndungu for their assistance in rhizobium inoculation, Steffen Schweizer and Christian Arter for their help in sample preparation and analysis, Andreas Papritz for statistical advice, and Björn Studer, Laurie Schönholzer and Christophe Zeder for their expert advice and technical support in the chemical analysis of the samples. Furthermore, we thank the Mercator Research Program of the ETH Zurich World Food System Center and the ETH Zurich Foundation for supporting this project financially.

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Correspondence to Roman Grüter.

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Responsible Editor: Fangjie Zhao

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Grüter, R., Meister, A., Schulin, R. et al. Green manure effects on zinc and cadmium accumulation in wheat grains (Triticum aestivum L.) on high and low zinc soils. Plant Soil 422, 437–453 (2018). https://doi.org/10.1007/s11104-017-3486-4

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  • DOI: https://doi.org/10.1007/s11104-017-3486-4

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