What ET Actually Means
Evapotranspiration combines soil evaporation and plant transpiration. Controllers use reference ET then adjust for plant type and density.
Field Verification
Walk zones monthly. If turf looks wilted while ET says decrease, your crop coefficients may be wrong or heads are clogged.
Uniformity First
Poor DU wastes ET math. Audit catch cans before blaming the algorithm.
Watering Windows
Align start times with wind and dew patterns—not just ET outputs.
Frequently Asked Questions
Is ET better than fixed schedules?
Usually yes in variable climates—if inputs stay honest.
Do I still need a rain sensor?
Often yes—local rainfall can beat forecast models.
