Quantifying the effect of soil compaction on three varieties of wheat (Triticum aestivum L.) using X-ray Micro Computed Tomography (CT)

Saoirse R. Tracy, Colin R. Black, Jeremy A. Roberts, Ann McNeill, Rob Davidson, Mark Tester, Marko Samec, Dean Korošak, Craig Sturrock, Sacha J. Mooney

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Aims: X-ray Micro Computed Tomography (CT) enables interactions between roots and soil to be visualised without disturbance. This study examined responses of root growth in three Triticum aestivum L. (wheat) cultivars to different levels of soil compaction (1. 1 and 1. 5 g cm -3). Methods: Seedlings were scanned 2, 5 and 12 days after germination (DAG) and the images were analysed using novel root tracking software, RootViz3D®, to provide accurate visualisation of root architecture. RootViz3D® proved more successful in segmenting roots from the greyscale images than semi-automated segmentation, especially for finer roots, by combining measurements of pixel greyscale values with a probability approach to identify roots. Results: Root density was greater in soil compacted at 1. 5 g cm -3 than at 1. 1 g cm -3 (P = 0. 04). This effect may have resulted from improved contact between roots and surrounding soil. Root diameter was greater in soil at a high bulk density (P = 0. 006) but overall root length was reduced (P = 0. 20). Soil porosity increased with time (P < 0. 001) in the uncompacted treatment. Conclusions: RootViz3D® root tracking software in X-ray CT studies provided accurate, non-destructive and automated three dimensional quantification of root systems that has many applications for improving understanding on root-soil interactions.

Original languageEnglish (US)
Pages (from-to)195-208
Number of pages14
JournalPlant and Soil
Volume353
Issue number1-2
DOIs
StatePublished - Apr 1 2012

Keywords

  • Automated root tracking software
  • Root architecture
  • Soil compaction
  • Triticum aestivum L.
  • X-ray Micro Computed Tomography

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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