This calculator determines crop ET since the last irrigation based on weather data from local weather stations associated with crop crop canopy size. It can be used on a smartphone (saved to home screen as an app), or on a desktop/laptop through a web browser like Chrome.
This version is available for strawberry, celery, cabbage, broccoli and cauliflower: https://ucanr-igis.shinyapps.io/irrigation-calc/
Instructions: enter crop type, canopy cover estimation (use Canopeo if unknown), choose the ETo zone based on field's location (click on map for details), and select the day of the last irrigation or significant precipitation in the calendar. A default application rate is chosen for each crop, and it can be modified by clicking in the calcalculator button. Click "Calculate" to view result in hours&min and inches/hour.
This version is available specifically for avocado: https://ucanr-igis.shinyapps.io/irrigation-calc-avo/
Please forward any feedback, questions or comments to abiscaro@ucanr.edu .