Plant water potential sensors
Plant water potential sensors are used to measure the water status or water potential in trees, vines or plants.
Background
Estimating irrigation needs based on conditions in the soil and atmosphere is challenging and indirect relative to the water status in the plant [1][2][3]. For several decades and across diverse species, in-plant water potential, which integrates soil, atmosphere, and plant properties and conditions, has emerged as the preferred measure of water status relative to plant growth and susceptibility to disease and crop yield and quality [4][5][6]
Measurement methods
Multiple methods exist to measure plant water potential for irrigation timing and experiments.
Stem psychrometer
A stem psychrometer uses the principle of psychrometry to measure water potential in the stem, leaf or root of the plant or tree. The psychrometer is installed by abrading the tree’s bark to access the plant xylem, then attaching the psychrometer chamber and sealing it against the xylem. The psychrometer chamber contains a thermocouple hygrometer...
Stem osmometer
Microtensiometer
A miniature tensiometer has been developed to measure water potential in the plant xylem tissue. The microtensiometer is a MEMS device that can measure water tensions down to -10MPa[9]. The microtensiometer is installed by drilling a hole into the tree xylem and placing the probe in contact with the tissue.
Scholander Pressure Bomb
The Scholander Pressure Bomb has been in use since the 1980s to measure plant water potential in scientific and commercial settings.
References
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<ref>tag; no text was provided for refs namedShackel2011 - ↑ Dixon, M.A.; Tyree, M.T. (1984-03-26). "A new stem hygrometer, corrected for temperature gradients and calibrated against the pressure bomb". Plant, Cell and Environment. 7 (9): 693–697. doi:10.1111/1365-3040.ep11572454.
- ↑ Meron, M.; Goldberg, S.Y.; Solomon-Halgoa, A.; Ramon, G. (2015). "Embedded stem water potential sensor". Precision agriculture '15. pp. 527–532. doi:10.3920/978-90-8686-814-8_65. ISBN 978-90-8686-267-2. Search this book on
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedPagay2014 - ↑ Zhu, Siyu (2020). "Development of Sensing Framework for the Soil-Plant-Atmosphere Continuum". doi:10.7298/t97s-c409.
- ↑ Zhu, Siyu (2017). "In-Plant Applications of a Micro-Tensiometer Water Stress Sensor". doi:10.7298/X4DF6P6Q.
- ↑ Pagay, Vinay (2021). "Dynamic aspects of plant water potential revealed by a microtensiometer". doi:10.1101/2021.06.23.449675. Unknown parameter
|s2cid=ignored (help) - ↑ Tyree, M. T.; Hammel, H. T. (1972). "The Measurement of the Turgor Pressure and the Water Relations of Plants by the Pressure-bomb Technique". Journal of Experimental Botany. 23: 267–282. doi:10.1093/jxb/23.1.267.
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