Lysimetry for Evaporation and Transpiration Measurement

by N. L. Klocke, Univ of Nebraska, North Platte, United States,
R. W. Todd, Univ of Nebraska, North Platte, United States,
D. L. Martin, Univ of Nebraska, North Platte, United States,



Document Type: Proceeding Paper

Part of: Grouting in Geotechnical Engineering

Abstract:

Large hydraulically weighed lysimeters were used to measure evapotranspiration (ET), evaporation (E), and transpiration (T). Weighing lysimeters for T measurements were covered to suppress E after the crops, including corn, soybeans and grain sorghum, were established. The row crops grew on either side of the weighing lysimeters used for E measurements. Three to four mini-lysimeters measured E across the interrow of these crops. E from the mini-lysimeters along with ET, derived from a weekly water balance, were used to calculate T. The mini-lysimeter/water balance information then could be compared with the weighing lysimeter data.

Subject Headings: Crops | Measuring instruments | Water resources | Evapotranspiration | Water balance | Evaporation | Transpiration

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