Climate estimates demand
Use reference ET with an appropriate crop coefficient to estimate crop water use. Satellite-based actual ET can help review field-scale patterns over time.
Irrigation scheduling tools for Oregon growers
This dashboard brings together irrigation scheduling tools available to Oregon growers. Each listing explains the tool’s purpose, available information, access options and key considerations for use.
Start with the decision you need to make
No single resource answers every irrigation question. Use weather-based crop ET to estimate demand, soil information to understand storage and field observations to verify root-zone conditions.
Compare tools and resources available to Oregon growers
Entries are grouped by function so users can distinguish a complete scheduling tool from a data viewer, calculator or supporting guide.
No exact match
Clear the search or choose “All” to see the complete directory.
The 3-check method
Irrigation decisions are stronger when climate estimates, soil information and field observations tell a consistent story. When the three checks do not align, review the inputs, measurements and field conditions before changing the schedule.
Soil defines storage
Account for available water capacity, effective rooting depth and the allowable depletion that fits the crop and growth stage.
The field verifies reality
Check soil moisture, rooting, crop condition, applied depth and distribution uniformity. Correct the model when the field disagrees.
Crop water use
ETc = Kc × ETrefSimplified root-zone balance
Dtoday = Dprevious + ETc − effective precipitation − net irrigationGross depth to apply
Gross = net refill ÷ application efficiencyTake the ET guide into the field
This two-page letter-size handout explains reference, crop and actual ET; shows a transparent root-zone water balance; and pairs each data source with the decision it can support.
- Designed for print or on-screen use
- Includes a worked irrigation-depth example
- Links back to this updateable tool directory
A durable guide to crop water use, root-zone balance and field verification
ETrefETcETa
Open PDF ↗
Primary sources used for verification
- U.S. Bureau of Reclamation AgriMet
- WSU Irrigation Scheduling Aids and Tools
- OpenET Data Explorer documentation
- OpenET FARMS documentation
- OpenET API documentation
- OSU Extension irrigation scheduling guide
- OSU Extension soil moisture monitoring guide
- USDA NRCS Web Soil Survey
- Irrigation in the Pacific Northwest
- OSU Ag Water tools
- irrigation calculators
External resource links last verified August 22, 2026. Tool availability, interfaces and account requirements may change. Questions or suggestions for the directory: floyid.nicolas@oregonstate.edu.