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ET-Based Scheduling Without the Buzzwords: Practical Field Guide

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.

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