The checkbook method of scheduling enables you to monitor a field's daily soil water balance (in terms of inches of soil water deficit), which can be used to plan the next irrigation. This method requires you to
- Monitor the growth of the crop.
- Observe the daily maximum air temperature.
- Select the daily evapotranspiration (ET) estimation from the crop water use table.
- Measure the rainfall or irrigation applied to the field.
- Calculate the new soil water deficit balance.
Deciding when to irrigate is a daily decision that depends on many changing factors. Learn how to adjust irrigation
- By season/growth stage
- When you increase the allowable soil water deficit
Learn how to set allowable soil water deficits for each field by
- Estimating soil water deficits
- Understanding crop water use and available water
- Factoring in pumping capacity
Application uniformity testing for center pivot irrigation systems explains how to:
- Conduct each of the steps in a uniformity test
- Use the Worksheet for uniformity testing (XLSX).
- Understand the uniformity coefficient (CUH)
- Interpret the results and determine whether or not you need to take additional steps
Watch the video to see a test being performed
The greatest risk of chemigation is the potential for accidental backflow of all or part of the chemical into the irrigation water source if the system is not properly set up, operated and maintained.
Pollution prevention devices
Do I need secondary containment for my fertigation tank?
Inspecting your chemigation system
Climate, weather and water resources
Resources from MDA include growing degree day (GDD) tools, temperature, freeze/frost dates, evapotranspiration, soil temperature, and weather data from the around Minnesota.
Select a time period and location for precipitation data.