RESEARCH: WATER STRESS
STUDIES |
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Measurement of Plant Water Status
in Microgravity. Maintaining an optimal air/water balance in the
root zone in microgravity has received considerable attention over
the past decade. Root-zone oxygen and moisture sensors in
microgravity can be misleading. We refined techniques to
measure the leaf-to–air temperature difference to determine plant
water status in controlled environments. |
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TO THE ABSTRACTS BELOW:
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Leaf Temperature: Applying the CWSI to Controlled
Environments
Derek Pinnock, B. Bugbee, and R. C. Morrow
Presentation: Agronomy Society of America
Nov. 10-14, 2002;
Indianapolis, IN |
INTRODUCTION Controlled
environments are characterized by highly restricted root-zone
volumes. Irrigation in controlled environments is usually
excessive and thus inefficient. Root-zone moisture sensors
often fail to represent water status due to poor contact with the
coarse media. Watering based on a measurement of plant water
status would increase irrigation efficiency and decrease water
stress.
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A Simple Test to Evaluate the Calibration Stability
and Accuracy of Infrared Thermocouple
Sensors
Derek Pinnock and B.
Bugbee |
INTRODUCTION Accurately
measuring surface temperature is not difficult when the surface, the
sensor, and air temperature are similar, but it is challenging when
the surface temperature is significantly different than air and
sensor temperatures. We tested three Infrared Thermocouple
sensors (IRT's) that had been used for two years in a greenhouse
environment. The importance of the correction for sensor body
temperature was also examined.
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