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The accuracy and utility of a low cost thermal camera and smartphone-based system to assess grapevine water status
The accuracy and utility of a low cost thermal camera and smartphone-based system to assess grapevine water status
- Source :
- Biosystems Engineering. 179:126-139
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Smartphones have several advantages over specialist monitoring systems including ubiquity, price, and ease of implementing updates. Thermal imaging can be used to assess plant water status and allow more informed irrigation decisions; unfortunately, this technique has not been widely adopted due to the high cost of equipment and the lack of a system to provide analysis and results in real-time. Several inexpensive thermal cameras that connect to smartphones have recently been released and one of these (FLIR One) was evaluated as part of a system to assess grapevine water status. Irrigation treatments were established on Cabernet Sauvignon and Chardonnay vines in an arid region. Thermal images were taken from the shaded side of the grapevine canopy and software was developed to automatically determine the temperature of the canopy and artificial reference leaves. The temperature readings and metrological inputs were used to calculate five indices of water status including the Crop Water Stress Index (CWSI) and the stomatal conductance index. The best performing was the CWSI, which does not require input from a weather station. Over 30 days of assessment, and a range of irrigation levels, measurements collected with the thermal camera were correlated with stem water potential (R2 = 0.61) and stomatal conductance (R2 = 0.74). Windy conditions appeared to be the major cause of variation between CWSI and stomatal conductance. Inexpensive thermal cameras have the potential to be an easy and accessible tool for the assessment of plant water status and to make better irrigation decisions.
- Subjects :
- Canopy
Crop water stress index
Irrigation
Stomatal conductance
010401 analytical chemistry
Soil Science
Monitoring system
04 agricultural and veterinary sciences
01 natural sciences
Arid
0104 chemical sciences
Weather station
Control and Systems Engineering
Thermal
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Environmental science
Agronomy and Crop Science
Food Science
Remote sensing
Subjects
Details
- ISSN :
- 15375110
- Volume :
- 179
- Database :
- OpenAIRE
- Journal :
- Biosystems Engineering
- Accession number :
- edsair.doi...........fa4a9b640de034df73225d2105d840bf
- Full Text :
- https://doi.org/10.1016/j.biosystemseng.2019.01.002