Crop water status estimation using thermography: multi-year model development using ground-based thermal images

Cohen, Yafit; Alchanatis, V.; Sela, E.; Saranga, Yehoshua; Cohen, S.; Meron, M.; Bosak, A.; Tsipris, J.; Ostrovsky, V.; Orolov, V.; Levi, A.; Brikman, R.

doi:10.1007/s11119-014-9378-1

Cited by 57 publications

(40 citation statements)

References 22 publications

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“…Recently, however, the development of both cheaper image acquisition systems and user-friendly, powerful data image processing packages has substantially increased the potential of the method for irrigation scheduling in commercial orchards [55,56]. Thermal readings can be made both at the plant level (ground-based imagery) [55,57] and from above the crop (airborne imagery), after installing the sensors on towers or cranes [58,59], on unmanned aerial vehicles (UAVs), also known as remote piloted aerial systems (RPAS) [60], planes [61] or satellites [62,63]. Ground-based and airborne thermal images can be combined to assess within-orchard spatial heterogeneity in water status, as demonstrated with grape [64] and olive plants [65].…”

Section: Thermal Sensingmentioning

confidence: 99%

“…The best distance, angle, and time of the day at which the images should be taken must be checked for the crop conditions. Not only the species, but also the cultivar [74] and developmental stage [59] have an influence on the readings. The user must also bear in mind that relationships between thermal readings and water-stress-related physiological variables must be determined to properly evaluate the information provided by thermal imagery [66,75].…”

Section: Ground-based Imagerymentioning

confidence: 99%

“…The user must also bear in mind that relationships between thermal readings and water-stress-related physiological variables must be determined to properly evaluate the information provided by thermal imagery [66,75]. The literature provides examples on the use of ground-based thermal imagery to detect water status changes in a variety of plants, from ornamental [76] to herbaceous [59,77] and woody crops [57,68,78].…”

Section: Ground-based Imagerymentioning

confidence: 99%

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Plant-Based Methods for Irrigation Scheduling of Woody Crops

Fernández

2017

Horticulturae

131

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Abstract:The increasing world population and expected climate scenarios impel the agricultural sector towards a more efficient use of water. The scientific community is responding to that challenge by developing a variety of methods and technologies to increase crop water productivity. Precision irrigation is intended to achieve that purpose, through the wise choice of the irrigation system, the irrigation strategy, the method to schedule irrigation, and the production target. In this review, the relevance of precision irrigation for a rational use of water in agriculture, and methods related to the use of plant-based measurements for both the assessment of plant water stress and irrigation scheduling, are considered. These include non-automated, conventional methods based on manual records of plant water status and gas exchange, and automated methods where the related variable is recorded continuously and automatically. Thus, the use of methodologies based on the Scholander chamber and portable gas analysers, as well as those of systems for measuring sap flow, stem diameter variation and leaf turgor pressure, are reviewed. Other methods less used but with a potential to improve irrigation are also considered. These include those based on measurements related to the stem and leaf water content, and to changes in electrical potential within the plant. The use of measurements related to canopy temperature, both for direct assessment of water stress and for defining zones with different irrigation requirements, is also addressed. Finally, the importance of choosing the production target wisely, and the need for economic analyses to obtain maximum benefit of the technology related to precision irrigation, are outlined.

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Section: Thermal Sensingmentioning

confidence: 99%

Section: Ground-based Imagerymentioning

confidence: 99%

Section: Ground-based Imagerymentioning

confidence: 99%

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Plant-Based Methods for Irrigation Scheduling of Woody Crops

Fernández

2017

Horticulturae

131

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“…Conversely, LWP was more stable due to stomatal closure and the most leaves were exposed to sunlight around midday, thermal images contained the highest temperature differences and were suitable to assess the canopy water stress [122] . The other method for the separating canopy from background was simultaneously collect thermal and color images of canopy [123][124][125] . Thermal and color images were aligned registered, and then canopy can be extracted based on segmentation algorithms of color image processing.…”

Section: Water Stress Measurementsmentioning

confidence: 99%

“…In addition, thermal image resolution plays an important role in eliminating inaccurate temperatures, especially the temperatures correlated to the edge pixels that contain both canopy and background [117] . Infrared thermography can be applied on vehicle-based [123] , UAV [118,126] and greenhouse [127] . Thermal images of plant and environmental parameters were collected synchronously, and thermal images need to be calibrated with radiometric correction.…”

Section: Water Stress Measurementsmentioning

confidence: 99%

Sensors for measuring plant phenotyping: A review

Qiu¹,

Wei²,

Zhang³

et al. 2018

International Journal of Agricultural and Biological Engineering

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Food crisis is a matter of prime importance because it becomes more severe as the global population grows. Among the solutions to this crisis, breeding is deemed one of the most effective ways. However, traditional phenotyping in breeding is time consuming and laborious, and the database is insufficient to meet the requirements of plant breeders, which hinders the development of breeding. Accordingly, innovations in phenotyping are urgent to solve this bottleneck. The morphometric and physiological parameters of plant are particularly interested to breeders. Numerous sensors have been employed and novel algorithms have been proposed to collect data on such parameters. This paper presents a brief review on the parameter measurement for phenotyping to describe its development in recent years. Some parameters that have been measured in phenotyping are introduced and discussed, including plant height, leaf parameters, in-plant space, chlorophyll, water stress, and biomass. And the measurement methods of each parameter with different sensors were classified and compared. Some comprehensive measurement platforms were also summarized, which are able to measure several parameters simultaneously. Besides, some deficiencies of phenotyping should be addressed, and novel methods should be proposed to reduce cost, improve efficiency, and promote phenotyping in the future.

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Canopy thermal response to water deficit of coffee plants under drip irrigation

Costa

Coelho

Barros

et al. 2020

Irrigation and Drainage

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To quantify water stress on coffee trees, leaf water potential (LWP) measurements are commonly performed in a Scholander chamber; however, this methodology is restricted to research activities, due to the difficulty of measurement in the field: sampling hours at predawn and intensive work. A crop water stress index (CWSI) based on leaf temperature has been used as indicative of LWP in several crops, and thermal images can be a precious tool for mapping LWP under intensive drip‐irrigated coffee areas, in order to adjust irrigation requirements according to soil moisture spatial variability. This study aims to define the relationships between the water potential of coffee leaf based on CWSI, calculated by means of a portable infrared sensor and a thermal camera, analysing correlation, precision and accuracy indexes. The study was conducted in Piracicaba, SP, Brazil, using Coffea arabica species of the Catuaí Red variety IAC 144 that was drip irrigated using tensiometers as matric potential sensors. The observed CWSI and LWP presented good correlations in the linear and cubic models. It was concluded that the CWSI is a good indicator of the water potential of a coffee canopy and can be an alternative to measurements of LWP from the Scholander chamber. © 2020 John Wiley & Sons, Ltd.

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Crop water status estimation using thermography: multi-year model development using ground-based thermal images

Cited by 57 publications

References 22 publications

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Plant-Based Methods for Irrigation Scheduling of Woody Crops

Sensors for measuring plant phenotyping: A review

Canopy thermal response to water deficit of coffee plants under drip irrigation

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