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Evapotranspiration Measurement in Controlled Environment Chambers

A Comparison between Time Domain Reflectometry and Accumulation of Condensate from Cooling Coils

^a USDA-ARS Crop Systems and Global Change Lab, Bldg. 001, Room 342 BARC-W, 10300 Baltimore Ave., Beltsville, MD 20705-2350
^b Univ. of Washington, Seattle, WA 98195
^c USDA-ARS Cropping Systems Research Lab., P.O. Box 909, Big Spring, TX 79720

View larger version (18K): [in this window] [in a new window]   Fig. 1. Schematic of condensate collection system.

View larger version (7K): [in this window] [in a new window]   Fig. 2. Location of TDR waveguide placement in the SPAR soilbin.

View larger version (25K): [in this window] [in a new window]   Fig. 3. The hourly dynamics of profile water volume in the six treatments from TDR water content data from the period 21 to 24 July 2005 (41–44 DAE).

View larger version (29K): [in this window] [in a new window]   Fig. 4. Daily ET rates over the growing season for individual treatments from TDR water contents (open circles) and condensate system (closed circles).

View larger version (38K): [in this window] [in a new window]   Fig. 5. Hourly ET from condensate data and photosynthetically active radiation (PAR) data for the three irrigation levels in the ambient (370 µmol mol–1) treatment.

View larger version (20K): [in this window] [in a new window]   Fig. 6. Hourly ET from TDR and condensate systems for the 370 µmol mol–1 treatment for 2 d in the experimental period.

View larger version (30K): [in this window] [in a new window]   Fig. 7. Comparison of daily ET rates condensate and TDR systems for the experimental period.