Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 July 1990
Published in Agron J 82:851-854 (1990)
© 1990 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Improved Sap Flow Gauge for Woody and Herbaceous Plants

S. L. Steinberg*, C. H. M. Van Bavel and M. J. McFarland

Dep. of Agric. Engin.
Dep. of Soil and Crop Sci., Texas A&M Univ., College Station, TX 77843.
Dep. of Agric. Engin.

* Corresponding author.

The internal wiring of an existing stem or trunk flow gauge was redesigned to obtain greater accuracy of the gauge itself, eliminate errors due to signal loss in connecting cables, and reduce the number of channels and of the computing required of the datalogger. Tests of the gauge conducted on bald cypress (Taxodium distichum) and Ficus retusa (L.) Nitida trees, in a greenhouse and in an urban backyard, and under well-watered and dry conditions gave daily sap mass flow rates that were within 5% of those obtained by direct weighing.

Contribution no. TA20246 from the Texas Agric. Exp. Stn.

Received for publication July 10, 1989.


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Copyright © 1990 by the American Society of Agronomy.