Détection du stress hydrique par thermographie infrarouge : application à la culture de la pomme de terre

Authors: Kotchi, Serge Olivier
Advisor: Viau, Alain
Abstract: Water stress affect the yield and the crop quality. For more than twenty years, remote sensing allowed several tools developments to assess water stress detection using sensors and model such as Crop Water Stress Index (CWSI). Sparse crop can generate error in the interpretation of this index. The use of an imaging-radiometer combined to a high spatial resolution visible image help to remove this weakness. This study present a new water stress index based in the use of infrared thermography. A first dataset was taken from greenhouse experimental set up on potatoes species (Highlite and Chieftain) using an hand-held imaging-radiometer (ThermaCAM SC 2000). Repeated measurements were made for water-stress induced plants and for well irrigated plants at different growing stages. The study showed that an early detection of water deficit by infrared thermography is possible as well as the detection of the significant response of plant to heat stress and leaf area change based on water stress intensity. Temperature differences between crop canopy and air (Tc - Ta) are strongly correlated with the water stress. The study has permitted the development of a new index named Area Water Stress Index (AWSI) and the results obtained with this index for water stress detection are very encouraging.
Document Type: Mémoire de maîtrise
Issue Date: 2004
Open Access Date: 11 April 2018
Permalink: http://hdl.handle.net/20.500.11794/17967
Grantor: Université Laval
Collection:Thèses et mémoires

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