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Plant and Soil

, Volume 398, Issue 1–2, pp 153–163 | Cite as

Interaction between silicon cycling and straw decomposition in a silicon deficient rice production system

  • A. Marxen
  • T. Klotzbücher
  • R. Jahn
  • K. Kaiser
  • V. S. Nguyen
  • A. Schmidt
  • M. Schädler
  • D. Vetterlein
Regular Article

Abstract

Background and aims

Rice plants (Oryza sativa L.) contain large quantities of silicon (Si) in form of phytoliths, which increase their resistance to abiotic and biotic stresses. The Si cycle through rice fields is hardly studied. We tested how increasing Si availability affects rice growth and the decomposability of the straw. Secondly we tested the role of straw recycling for Si availability.

Methods

In a field experiment, we applied three levels of silica gel during one rice cropping season. In a follow-up laboratory experiment, we used straw produced in the field experiment, having different Si concentrations, and studied straw decomposition, straw Si release, and Si uptake by plants.

Results

Silicon fertilization increased Si contents, biomass production, and grain yield of rice plants. Increased Si uptake by rice decreased concentrations of C and some essential nutrients (N, P, K, Ca, and Mg) in the straw, and increased straw decomposability and Si release.

Conclusions

Fertilization with silica gel is an option to improve Si supply to rice plants growing on weathered soils with low levels of plant-available Si. Phytoliths from fresh rice straw dissolve fast in soil, thus, recycling of rice straw is an important source of plant-available Si.

Keywords

Paddy soils Phytolith dissolution Rice straw decomposition Rice straw recycling Silicon fertilization Vietnam 

Notes

Acknowledgments

This work has been financed by the LEGATO project of the German Ministry for Education and Research (BMBF). We thank the coordinator of the project, Josef Settele, for his support. We thank Nguyen Hung Manh for the field work and Alexandra Boritzki, Aleksey Prays, Susanne Horka, Andreas Rämmler, Jutta Fröhlich, and Bernd Apelt for technical assistance. We thank the farmers for allowing us to establish the experiment on their paddies.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • A. Marxen
    • 1
  • T. Klotzbücher
    • 2
  • R. Jahn
    • 2
  • K. Kaiser
    • 2
  • V. S. Nguyen
    • 4
  • A. Schmidt
    • 3
  • M. Schädler
    • 3
  • D. Vetterlein
    • 1
  1. 1.Helmholtz Centre for Environmental Research - UFZ, Soil PhysicsHalleGermany
  2. 2.Institute of Agricultural and Nutritional Sciences, Soil ScienceMartin-Luther-University Halle-WittenbergHalleGermany
  3. 3.Helmholtz Centre for Environmental Research - UFZ, Community EcologyHalleGermany
  4. 4.Institute of Ecology and Biological ResourcesVietnam Academy of Science and TechnologyHanoiVietnam

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