Poster (Scientific congresses and symposiums)
T-26. Exploring Root Uptake Under High Frequency Irrigation Using Electrical Resistivity Tomography
Garré, Sarah; Furman, Alex; Assouline, Shmuel et al.
2013AGU Chapman conference BIOSPHERE II
 

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Keywords :
ERT; bell pepper; irrigation
Abstract :
[en] Root uptake and its relation to environmental factors, and primarily soil water content, are perhaps the least understood component in terrestrial water balance and is of high importance for water resources management, ecology and agriculture. In this research we explore the spatial and temporal distribution of soil water in high resolution using electrical resistivity tomography (ERT). Bell peppers were planted in a chamber and irrigated in two different schemes, differing only in irrigation frequency (daily and eight-daily irrigation, where the daily dose is equal for both treatments). This irrigation difference results in very different spatio-temporal distribution of the soil water in the root zone, which in turn derives spatio-temporal differences in root uptake. Experiment was conducted under a screen-house in Mediterranean summer conditions, i.e. very high evapotranspiration. Resistivity surveys, using 96 electrodes placed around the growth chamber and at soil surface (Figure 1) were taken over 10 times daily. Plants subjected to high frequency irrigation generally were faster in growth and matured about a week earlier. This is primarily attributed to the higher water content that exists in the root zone, and primarily during the climatically stressing noon hours. Inverted images (e.g. Figure 2) provide an interesting insight into the spatio-temporal distribution of the root uptake. This in turn can now be correlated to the spatial location of the roots, and to the soil induced water content dynamics.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Garré, Sarah  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Furman, Alex
Assouline, Shmuel
Günther, Thomas
Language :
English
Title :
T-26. Exploring Root Uptake Under High Frequency Irrigation Using Electrical Resistivity Tomography
Publication date :
22 October 2013
Event name :
AGU Chapman conference BIOSPHERE II
Event organizer :
AGU
Event place :
Tucson, United States
Event date :
21-10-2013 to 24-10-2013
Audience :
International
Funders :
research grant No. IS-­‐3823-­‐06 from BARD, the United States – Israel BinaMonal Agricultural Research and Development Fund
Commentary :
Computational resources have been provided by the supercomputing facilities of the Consortium des Equipements de Calcul Intensif en Fédération Wallonie Bruxelles (CECI) funded by FRS-FNRS.
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