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

Plant and Soil
Huan FangPaul D Hallett

Abstract

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. 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. AWD induced formation of macropores and slightly increased soil mechanical impedance. The total root length of the AWD and REPACKED treatments were 1.7...Continue Reading

References

Jul 9, 2009·Journal of Experimental Botany·Andrew P Whitmore, W Richard Whalley
Jul 15, 2009·Proceedings of the National Academy of Sciences of the United States of America·Kenneth L McNallyJan E Leach
Sep 29, 2009·Current Opinion in Plant Biology·Gabriele B Monshausen, Simon Gilroy
Nov 10, 2009·Plant, Cell & Environment·Rosemary G White, John A Kirkegaard
Apr 2, 2011·Plant Physiology·Randy T ClarkLeon V Kochian
Jun 12, 2012·Annals of Botany·Tracy A ValentineA Glyn Bengough
Jan 31, 2013·Proceedings of the National Academy of Sciences of the United States of America·Suqin FangPhilip N Benfey
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Oct 8, 2016·The Science of the Total Environment·Tino ColombiAchim Walter

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Methods Mentioned

BETA
X-ray
soil treatments
soil

Software Mentioned

WinRhizo
ImageJ
SPSS
CT Pro 3D
IsoData
BoneJ

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