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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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
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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
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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. |
