Evapotranspiration (ET) is the transfer of water in the form of water vapor from surfaces and through plants. ET values are impacted by many soil, plant, and management practices; however, climatic conditions, such as solar radiation, wind speed, temperature, and humidity are the primary drivers. The High Plains Regional Climate Center (HPRCC) measures ET at their AWDN stations located across Nebraska and the High Plains. These stations produce an alfalfa reference ET which is multiplied by the crop coefficient to get a crop water use. In the graphs below, I looked at the daily ET values and compared them to wind speed, solar radiation, relative humidity and high temperature from the Havelock AWDN station in Lincoln, NE from May 1, 2014 to September 1, 2014. This is a preliminary look and I will be compiling 30 year data to look at trends and statistics. Here is NebGuide G1994 from Suat Irmak for more information on ET.
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