Interaction between contrasting rice genotypes and soil physical conditions induced by hydraulic stresses typical of alternate wetting and drying irrigation of soil

Huan Fang, Hu Zhou, Gareth J Norton, Adam H Price, Annette C Raffan, Sacha J. Mooney, Xinhua Peng, Paul D Hallett

Research output: Contribution to journalArticle

4 Citations (Scopus)
10 Downloads (Pure)

Abstract

Background and aims: Alternate wetting and drying (AWD) saves water in paddy rice production but could influence soil physical conditions and root growth. This study investigated the interaction between contrasting rice genotypes, soil structure and mechanical impedance influenced by hydraulic stresses typical of AWD.
Methods: Contrasting rice genotypes, IR64 and deeper-rooting Black Gora were grown in various soil conditions for 2 weeks. For the AWD treatments the soil was either maintained in a puddled state, equilibrated to −5 kPa (WET), or dried to −50 kPa and then rewetted at the water potential of −5 kPa (DRY-WET). There was an additional manipulated macropore structure treatment, i.e. the soil was broken into aggregates, packed into cores and equilibrated to −5 kPa (REPACKED). A flooded treatment (puddled soil remained flooded until harvest) was set as a control (FLOODED). Soil bulk density, penetration resistance and X-ray Computed Tomography (CT) derived macropore structure were measured. Total root length, root surface area, root volume, average diameter, and tip number were determined by WinRhizo.
Original languageEnglish
Pages (from-to)233-243
Number of pages11
JournalPlant and Soil
Volume430
Issue number1-2
Early online date29 Jun 2018
DOIs
Publication statusPublished - Sep 2018

Keywords

  • Rice roots
  • Genotype
  • Macropores
  • Mechanical impedance
  • Soil structure
  • X-ray CT

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