Penman-Monteith Evapotranspiration in GP2 Logger Controller - Technical Notes

The GP2 Data Logger and DeltaLINK software (versions 3.7 and later), in combination with relevant sensors, enables the full ASCE/FAO-56 Penman-Monteith equation for calculating crop reference evapotranspiration (ETo). ETo calculated by the GP2 Data Logger uses measurements of relative humidity, wind speed, solar radiation, and air temperature, so sensors for these must be present. This ETo implementation includes the ability to vary crop albedo, Leaf Area Index (LAI), canopy resistances, crop height and sensor heights. The functionality is easily accessed as a selectable recording option within DeltaLINK. Calculated ET can be recorded as hourly and daily values – and may be used in further bespoke calculations or to guide field irrigation decisions. ET dashboards and time series graphs can be viewed online if suitable internet connection to DeltaLINK Cloud exists. This is all also available to the WS-GP2 Weather Station.