Evapotranspiration (ET) is the loss of water to the atmosphere by the combined processes of evaporation (from soil and plant surfaces) and transpiration (from plant tissues). It is an indicator of how much water your crops need for healthy growth and productivity. ET from a standardized grass surface is commonly denoted as ETo.

Daily ETo averages are provided by The Pacific Northwest Cooperative Agricultural Weather Network (AgriMet). For more information, please visit them at http://www.usbr.gov/pn/agrimet/index.html.

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