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Can silicon in glacial rock flour enhance phosphorus availability in acidic tropical soil?

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Abstract

Background and aim

Plant-available silicon (Si) is limited in strongly weathered tropical soils. The aim of the study was to evaluate Si fertilisation as a strategy to improve phosphorus (P) fertiliser use efficiency on acidic tropical soil, and the potential of using glacial rock flour (GRF) as a source of Si.

Methods

Wheat (Triticum aestivum cv. Benchmark) plants were grown in a pot experiment in an oxisol soil. Si was supplied as either GRF or silicic acid (SiA) at low and sufficient P levels. A soil incubation study and a compartmented pot experiment were also included to assess how soil chemistry was affected by the Si sources both with and without plants.

Results

Addition of Si as either GRF or SiA doubled shoot biomass under limited P conditions, and the combined treatment quadrupled it. SiA led to increased P uptake under P-limited conditions, while GRF did not. Soil incubation showed that only SiA increased P availability in bulk soil. The addition of SiA in combination with GRF led to increased root exudation of citric and oxalic acid. Localised weathering of GRF resulted in higher rhizosphere pH, but did not affect rhizosphere P availability or organic acid exudation.

Conclusion

Si released from GRF can rejuvenate strongly weathered agricultural soils, improve stress tolerance in plants and ultimately increase yields but GRF does not improve P availability on acidic soils.

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Datasets can be provided by the corresponding author on reasonable request.

References

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Funding

This work was funded by the Novo Nordic Foundation (grant number: NNF16SH20278) and by the Independent Research Fund Denmark | Technology and Production Sciences (grant number DFF-9041–00022).

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Authors

Contributions

All the authors contributed to the experimental design. Material preparation and data collection and analysis were performed by Klara Cecilia Gunnarsen, who also wrote the first draft of the manuscript. All the authors contributed to the revision of the manuscript and approved the final version.

Corresponding author

Correspondence to Klara Cecilia Gunnarsen.

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Conflicts of interest

The authors declare that they have no conflicts of interest.

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Responsible Editor: Christopher Guppy.

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Gunnarsen, K.C., Schjoerring, J.K., Gómez-Muñoz, B. et al. Can silicon in glacial rock flour enhance phosphorus availability in acidic tropical soil?. Plant Soil 477, 241–258 (2022). https://doi.org/10.1007/s11104-022-05399-0

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  • DOI: https://doi.org/10.1007/s11104-022-05399-0

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