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Evolution des propriétés hydrauliques de substrats en culture de rosier sous régime d’irrigation entre -1kPa (pF=1) et -10kPa (pF=2)

Abstract : Irrigation management in soilless culture is classically based on three main physical parameters of growing media (total porosity, air filled porosity, and water holding capacity), previously estimated in the laboratory by the NF EN 13041 standard method. More important than water and air content in the media, their flows are of vital importance because water, air, and solute availability highly fluctuate over a short period of time in this growing system. The limited volume of substrate for plants growing in pots or containers, and the large and rapid root colonization cause frequent cycles of watering and drying during growing management which lead to changes in solid phase organization and pore size distribution, and then to changes in water and air contents and flows in the media. Therefore, the evolutions of the physical and hydraulic properties of the substrate-root system have to be considered for better irrigation management and water efficiency for plants. Some experiments were carried out on Rosa Radrazz grown in greenhouses during 3-6 months experiment, in 1 to 1.6 L cylindrical pots filled with four organic growing media that are used commonly throughout the world (wood fiber, pine bark, coco fiber, and peat). During these experiments, water and air retentions, hydraulic conductivity and relative gas diffusivity were analyzed. One of the most important observed results was a large decrease in air-filled porosity. However, the increase in pore connectivity (i.e., the decrease in the calculated pore tortuosity) due to the root development and pore distribution changes related to drying/wetting cycles helped to limit the decreases in water conductivity and relative gas diffusivity.
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Submitted on : Tuesday, April 21, 2020 - 4:23:25 PM
Last modification on : Monday, July 6, 2020 - 3:38:31 PM

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  • HAL Id : hal-02549683, version 1

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Eric Kerloch, Jean-Charles Michel. Evolution des propriétés hydrauliques de substrats en culture de rosier sous régime d’irrigation entre -1kPa (pF=1) et -10kPa (pF=2). 8èmes Rencontres du Végétal, Jan 2015, Angers, France. ⟨hal-02549683⟩

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