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Reductive soil disinfestation promotes vegetable N uptake by regulating soil gross N transformation and improving the quality of degraded soil

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Abstract

Purpose

Reductive soil disinfestation (RSD) has been widely applied to improve soil degradation, enhancing vegetable N uptake and productivity. However, its effects on interactions between vegetable N uptake and soil gross N transformation remain unclear.

Methods

Two degraded vegetable soils were treated with RSD and 15N tracing pot experiments were conducted to quantify the effects of RSD on N cycling in vegetable-soil systems.

Results

Vegetable NH4+ and NO3 uptake rates were 1.0–6.5 times higher following RSD than CK, while soil gross N mineralization rates (M) ranged from 0.83–13.00 mg N kg−1 d−1, and were significantly higher than the CK (0.21–8.71 mg N kg−1 d−1). Meanwhile, autotropic nitrification rate (ONH4) increased by 1.7–4.2 following RSD, while NH4+ immobilization rates (INH4) were significantly inhibited by RSD in the presence of planting. This induced a decrease in (ONH4 + INH4)/M, and increases in NH4+ retention times and production rates of soil NO3 following RSD. In addition, RSD improved the overall quality of the degraded soils (increasing the pH, and decreasing EC and NO3 contents as well as pathogen abundance), further promoting vegetable N uptake.

Conclusion

RSD promoted vegetable N uptake by regulating soil gross N transformation rates and improving the quality of degraded vegetable soil. However, NO3 production rates were enhanced following RSD, increasing the risk of NO3 leaching and gaseous N losses. N fertilizer management under RSD therefore requires further attention.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant number 41830642), the Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX21_1332), and the “Double World-Classes”: Development in Geography Project. The study was carried out as part of the IAEA-funded coordinated research project, “Minimizing farming impacts on climate change by enhancing carbon and nitrogen capture and storage in Agro-Ecosystems (D1.50.16)”, and was carried out in close collaboration with the German Science Foundation research unit DASIM (FOR 2337).

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Correspondence to Jinbo Zhang.

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The authors have no relevant financial or non-financial interests to disclose.

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Responsible Editor: Leo M. Condron.

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Dan, X., He, M., Chen, S. et al. Reductive soil disinfestation promotes vegetable N uptake by regulating soil gross N transformation and improving the quality of degraded soil. Plant Soil 498, 147–160 (2024). https://doi.org/10.1007/s11104-022-05683-z

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  • DOI: https://doi.org/10.1007/s11104-022-05683-z

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