Evapotranspiration
Updated
by
Travis Bates
ZENTRA Cloud follows the standard FAO 56 Penman-Monteith guidelines for calculating evapotranspiration. Users can choose between ETr (alfalfa) reference or ETo (grass) reference depending on preference.
Standardized Reference Evapotranspiration Equation:
METER Sensors that support ET:
OR a combination of
- ATMOS 14/VP-4/VP3 - air temperature, vapor pressure.
- Pyronometer- solar radiation
- ATMOS 22/DS-2 OR DAVIS CUP ANEMOMETER- wind speed.
ETo
- Click the environmental model icon.
- Select ETo or ETr.
- Enter a name for the model and a name for the chart.
- The default wind measurement height is 2 meters. Enter a custom value if needed.
- Select a device. The sensor inputs for Wind Speed, Solar Radiation, Vapor Pressure and Air Temperature will auto-populate. Select different sources for these inputs if necessary.
- Click Create.
Accumulated ETo
- Click the Vertical Ellipse icon.
- Select Stats.
- Toggle the desired measurements.
- Click Accept.
