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Plant and Soil

, Volume 404, Issue 1–2, pp 173–192 | Cite as

A quantitative analysis of root distortion from contrasting wheat cropping systems

  • Yi Zhou
  • David R. Coventry
  • Matthew D. DentonEmail author
Regular Article

Abstract

Aims

The objective of this study was to analyse root distortion and root types in contrasting wheat cropping systems, and to determine their impact on yield.

Methods

Two field experiments with contrasting soils (structured vs poorly structured) were conducted using two tillage treatments (no-tillage, NT and conventional-tillage, CT), 4 straw mulch additions (0, 0.5, 2.5 and 5 t ha−1) and 3 N application rates (0, 25 and 100 kg ha−1). A novel methodology to describe root distortion was developed using vector geometry. Root length (RL), root distortion rate (RDR) and percentage of root types were the root parameters measured.

Results

In structured soil, NT had lower RL (127 cm vs 184 cm), but higher RDR (36 ° cm−1 vs 26 ° cm−1) than CT, while the differences were not significant in unstructured soil. Heavy straw mulch reduced nodal roots (Nodal% 6.2 % vs 8.0 %) in both experiments. High N addition increased RL and RDR, but reduced Nodal% compared with low or no N application. RDR and Nodal% were positively correlated to grain weight, stem biomass, photosynthetic rate and stomatal conductance (r = 0.71 to 0.80).

Conclusions

Higher RDR in the NT system in structured soil or greater Nodal% in low/medium straw mulch in the unstructured soil positively affected photosynthesis and biomass production.

Keywords

Wheat systems Root distortion No till Australia 

Notes

Acknowledgments

This work was funded by the Australian Centre for International Agricultural Research project (CIM/2011/027). We thank Chris Penfold, Nigel Charman and Judith Rathjen at The University of Adelaide and Bill Davoren at CSIRO for help in establishment and maintenance of the field trials and collection of data.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Yi Zhou
    • 1
  • David R. Coventry
    • 1
  • Matthew D. Denton
    • 1
    Email author
  1. 1.School of Agriculture Food and WineThe University of AdelaideGlen OsmondAustralia

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