Construction, installation, and performance of two repacked weighing lysimeters

Payero, Jose O. and Irmak, Suat (2008) Construction, installation, and performance of two repacked weighing lysimeters. Irrigation Science, 26 2: 191-202.


Author Payero, Jose O.
Irmak, Suat
Title Construction, installation, and performance of two repacked weighing lysimeters
Journal name Irrigation Science   Check publisher's open access policy
ISSN 0342-7188
1432-1319
Publication date 2008-01
Year available 2007
Sub-type Article (original research)
DOI 10.1007/s00271-007-0085-9
Volume 26
Issue 2
Start page 191
End page 202
Total pages 12
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract Weighing lysimeters are the standard method for directly measuring evapotranspiration (ET). This paper discusses the construction, installation, and performance of two (1.52 m × 1.52 m × 2.13-m deep) repacked weighing lysimeters for measuring ET of corn and soybean in West Central Nebraska. The cost of constructing and installing each lysimeter was approximately US $12,500, which could vary depending on the availability and cost of equipment and labor. The resolution of the lysimeters was 0.0001 mV V−1, which was limited by the data processing and storage resolution of the datalogger. This resolution was equivalent to 0.064 and 0.078 mm of ET for the north and south lysimeters, respectively. Since the percent measurement error decreases with the magnitude of the ET measured, this resolution is adequate for measuring ET for daily and longer periods, but not for shorter time steps. This resolution would result in measurement errors of less than 5% for measuring ET values of ≥3 mm, but the percent error rapidly increases for lower ET values. The resolution of the lysimeters could potentially be improved by choosing a datalogger that could process and store data with a higher resolution than the one used in this study.
Keyword Crop Coefficients
Irrigated Corn
Energy Balance
United-States
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Published online: 28 August 2007. Communicated by T. Trooien.

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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