Distribution Uniformity: The Number That Caps Your Yield Consistency
Emission uniformity (EU) and distribution uniformity (DU) as measurable numbers, the CV of manufacturing, how pressure and line length degrade uniformity, and the catch-can test that turns 'the plumbing is fine' into a defensible metric.
You cannot steer a room that waters unevenly
The intro lesson made the case that uniform irrigation is a plumbing problem before it is an agronomy problem. This lesson gives you the number. Distribution uniformity (DU) and emission uniformity (EU) quantify how evenly every dripper in a zone delivers water. If your best-fed plants get 15% more water per shot than your worst-fed, no P0-P3 recipe, no EC target, and no dryback setpoint applies evenly across the room — half your canopy is running a different recipe than the one on your controller screen. In rockwool, where slab EC tracks the feed almost directly and there is near-zero CEC buffer, poor uniformity translates one-to-one into scattered slab EC. In coco the buffer masks it for a while, then reveals it as ragged canopies you will wrongly blame on genetics.
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