Actual evapotranspiration [mm]
Actual evapotranspiration is the quantity of water that is actually removed from the land surface through evaporation of water from the soil, plant canopies, and open water bodies plus transpiration by the plant (all together constituting the actual water consumption). Evapotranspiration is commonly estimated by multiplying Reference Evaporation with a crop factor but is no longer necessary using the FruitLook technology. FruitLook calculates actual evapotranspiration directly from the crop. You can find more information on using the Actual Evapotranspiration in the March 2015 newsletter.
Evapotranspiration deficit [mm]
The evapotranspiration deficit is the number of millimeters of water per week your crop missed to achieve the maximum evapotranspiration (and growth). Evapotranspiration deficit is the difference between the potential evapotranspiration and the actual evapotranspiration. It reflects the crop`s shortfall in what it can potentially achieve under ideal conditions. It is an indicator of plant water stress. Evapotranspiration deficit does not necessarily to be zero during the entire growing season. As a farmer you know exactly when you can apply stress and when not. The evapotranspiration deficit helps you to apply water stress and save water when needed, for example to control the vigour of your vines at critical growth stages.You can find more information on using the Evapotranspiration Deficit in the March 2015 newsletter.
Biomass Water Use Efficiency [kg/m3]
While biomass production shows you how much biomass has been produced per unit of land (kg/ha), the biomass water use efficiency shows how much biomass has been produced per unit of water (kg/m3) consumed by the crop. Especially when you have a limited water allocation but sufficient , the biomass water use efficiency helps you to determine the optimal amount of irrigation application. You can find more information on using the Evapotranspiration Deficit in the April 2015 newsletter.
Crop Factor KcKs [-]
The crop factor is used to calculate the actual evapotranspiration from the reference evapotranspiration. It incorporates the effect of a specific crop (Kc) as well as the effect of water stress (Ks) on the water consumption of the specific crop.