Weather - Crop Data
Navigating to this tab, users can choose between three (3) sub-menus, as shown in the image below:
Add Evapotranspiration Prediction
When users select the first option named "Add Evapotranspiration Prediction", they are able to produce evapotranspiration (ET) prediction charts, so as to manage their actions on their field, according to the results that are shown on each bar chart. This chart presents either the ETo (reference), or the ETc (crop) evapotranspiration. Specifically, in the chart, the calculated evapotranspiration and the precipitation daily (in mm) for the selected field and the accumulated evapotranspiration and precipitation (in mm) are shown.
This tab enables users to produce and view evapotranspiration charts for the selected field, providing them with the options shown in the following figure.
Select ETo or ETc chart
Close the evapotranspiration chart window
Evapotranspiration reference (ETo)
Select date for the prediction (default is current date)
Procedure chart button for the given date
Close the evapotranspiration chart window
Evapotranspiration crop (ETc)
Select date (default is current date)
Select growth stage
Select crop for the prediction
Procedure chart button for the given parameters
Close the evapotranspiration chart window
Show Growing Degree Days (GDD)
The GDDs for a specific time interval graph, illustrate the cumulative thermal energy received by crops over a defined period, expressed in GDDs. GDDs are calculated by summing the daily mean temperatures above a certain threshold, known as the base temperature, which varies depending on the crop species. This graph provides valuable insights into the thermal conditions experienced by crops throughout the growing season, allowing farmers to monitor the progress of crop development and predict key growth stages such as germination, flowering, and maturity. By tracking GDD accumulation over time, farmers can make informed decisions regarding planting dates, crop selection, and management practices to optimize yield and quality.
Show Chilling Hours (CH)
The figure below shows the alternative options provided to users so as to view the chilling hours of the selected field.
1. Standard model
Temperatures between 0°C and 7.2°C have a chilling effect, with each hour at temperatures between these thresholds contributing one chilling hour. Chilling hours are accumulated throughout the dormant season and then summed up
2. Utah Model
1 hour below 1.1 ˚C = 0.0 chill unit
1 hour 1.1 – 2.5 ˚C = 0.5 chill unit
1 hour 2.5 – 8.9 ˚C = 1.0 chill unit
1 hour 8.9 – 12.5 ˚C = 0.5 chill unit
1 hour 12.5 – 15.5 ˚C = 0.0 chill unit
1 hour 15.5 – 18.3 ˚C = -0.5 chill unit
1 hour > 18.3 ˚C = -1.0 chill unit
3. Dynamic Model
The dynamic model calculates chill in units known as “chill portions”, based on hourly temperatures. Effective winter chill temperatures follow a bell shape with an optimum chilling temperature at 6°C, tapering to zero at -2°C and 14°C.
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