← All questions

Asked by tom5436 ·July 28, 2018 ·24.5k readers

Nutrient Schedule

Hello all, I have a couple questions about the nutrient schedule. In a workshop at Brown Bottle Farm Drake used this diagram to explain the nutrient schedule. KNF Nutrient Schedule First off, I can't remember what the II, XO, and III refer to? Secondly, When do I start alternating between the Leaf Enhancement to the Flowering Enhancement? In the KNF recipe book it shows about 4 weeks of just Leaf Enhancement and then start alternating between the Leaf Enhancement to Flower Enhancement. The chart you showed at the workshop seems as tho I should start alternating right after the change over period. Thank you!

nutrient-cycle nutrient-schedule

Top answer

infinitesugar · Aug 22, 2018
I think the “II”, “XO” and “III” refer to the different solution enhancements... for example II would be the maintenance solution (BRV, OHN, FPJ) + FAA. It’s basically the vegetative solution. XO would be Crossover, so Maintenance + WCP. And then III would be Maintenance Solution + WCA. WCP isn’t just used for flowering, it also enhances root and structure. That’s why you want to alternate II and XO Even before flowering begins.   PS, if you’re wondering, I believe type I would be considered seed soak and / or soil preparation.

From the KNF library

From the KNF library Drafted by Claude from Office Hours and the books · Sep 2026 · 2 sources

The library defines one of the three terms and does not define the other two.

Cho ties the III type to the changeover period, when the C/N value should be increased. (Cho, Theory, p. 115) He says the flowering period is like an early changeover period. (Cho, Theory, p. 115)

The library never defines II or XO. Its recipe table for Cho's solutions does match stages to ingredients:

  • Leaf & Growth: FAA, 4 mL per gallon. (Cho's Solutions, p. 12)
  • Root, Flower & Structure: WCP, 5 mL per gallon. (Cho's Solutions, p. 12)
  • Fruit, Seed & Reproductive: WCA, 4 mL per gallon. (Cho's Solutions, p. 12)

The library does not say when to start alternating, and it does not hold the workshop diagram. It does say the crossover period between growth and reproduction is hardest on the body. (Cho's Solutions, p. 12) It says fruit trees at that stage require close observation. (Cho's Solutions, p. 12) Watch your plants at changeover, then bring your schedule to a show so Drake can look at your setup.

Sources

  • p. 12 Cho's Solutions · “Leaf & Root, Flower Fruit, Seed & Enhanced”
  • p. 115 Cho, Theory · “The changeover period is a time when the C/N value should be increased (III type).”

Also discussed on Office Hours

Know the answer? Members answer, ask, and get their questions onto the Sunday show.

Sign in Become a member