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Asked by superk ·August 26, 2018 ·15.9k readers

NPK values for KNF method solutions

Have the solutions for this system been tested for their respective NPK values yet? We are applying bi-weekly (using the App suggested amounts) with only marginal results and are wondering if the volume of the solutions are  either too weak or too strong. The biggest issue with my plants is yellowing leaves. I get that the N is either deficient or too prevalent (both conditions will cause yellowing but too much will add tip burn. But so will wind damage). I have recently started doubling up the App amounts  into the same volume of water with no change in the way the plants look. Has there been any testing on these numbers and if so, where might we find it?

Top answer

From the KNF library

From the KNF library Drafted by Claude from Office Hours and the books · Sep 2026 · 3 sources

The library has no NPK test of the KNF solutions, and it does not say where to find one.

Master Cho does not track NPK. He uses one balanced fertilizer the whole cycle, though Drake thinks that oversimplifies the biology. (Office Hours Ep. 140, 54:13)

Drake's manual warns that a lot of people over nitrogen their plants. (Pure KNF Manual, p. 47) It compares PureFuel to fuel on a fire. When the fire already blazes, adding more accelerant is probably crazy dangerous. (Pure KNF Manual, p. 47) That suggests doubling the dose may not help.

  • PureFuel matters most when a plant is a juvenile. Older plants need less, because they make more of their own amino acids. (Pure KNF Manual, p. 47)
  • Drake balances the solutions. More PureFuel at 1:1000 means less PureStructure and PureReproduction at 1:2000, which can assist vegetative growth. (Pure KNF Manual, p. 47)

On timing, one study in the library found that two IMO applications two weeks apart increased kai choi growth compared with one. (Unravelling the Mysteries of KNF, p. 140)

The library does not diagnose yellowing leaves or say what your App amounts contain. Drake would need to see your setup.

Sources

1 more answer
superk L2 Manufacturer · provisional · Aug 31, 2018
Thank you for the response, I am going to continue to do the spraying and hope things work out.

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