Plant Nutrition & the Water Room

What N, P and K actually do, why mobility decides WHERE a deficiency shows, and the peer-reviewed data that kills the bloom-booster myth.

Why Ca and Mg are the make-or-break elements on RO water and in coco, target concentrations, and the transpiration link most growers miss.

The trace elements, the mobility that puts their symptoms in new growth, and the diagnostic discipline that stops you from over-dosing a healthy feed.

Parallel feed-EC, drain-EC and pH targets stage by stage for both substrates, plus the buffering physics that makes coco forgiving and rockwool unforgiving.

The universal anatomy of any commercial line — Part A + Part B plus optional Cal-Mag, silica, PK and finisher — and how to translate any manufacturer's chart to your own water.

Testing your source water, why concentrates live in separate tanks, injector vs batch fertigation, and the daily logging discipline that catches drift before it costs a crop.

The step-by-step flagship procedure for mixing a repeatable, precipitate-free batch and hitting your target EC and pH every time.

When to send dried-tissue samples, when to run in-house sap analysis, how to sample old vs new leaves as a pair, and how to turn a lab report into a feed adjustment before a visual symptom ever appears.

A decision tree that separates true deficiency from pH lockout from salt-stacking EC creep, and the corrective-flush numbers (½-strength feed, media-volume math) that fix it in coco and rockwool without shocking the crop.

Why EC alone hides the two water problems that wreck a program — bicarbonate alkalinity and sodium/chloride — plus the acid-to-alkalinity math and the RO-blend decision, all brand-agnostic.

Ratio-based injectors vs EC-controlled dosers, the stock-tank dilution-factor math, why A and B need separate channels, and the verify-at-the-emitter calibration routine that catches drift before the crop does.