What is Mineral A-D? Calcium Phosphate & Calcium... do you need Phosphoric Acid too?
@Drake, how are you? I have two questions..
I have been natural farming for a while but I have never seen this before...
This PDF on the site: https://naturalfarminghawaii.net/wp-content/uploads/2013/09/Mineral.pdf
These minerals, A-B-C-D, what exactly are they?
Also, when it comes to using calcium phosphate week before/change over/maybe week after... and calcium later in flower, ( I have seen a KNF input for phosphoric acid)..
When is WSPA (acid) used vs. WSCP (calPhos) ? OR, do you not need all these inputs, just WSCA and WSCalPhos?
Thank you.
Top answer
Mineral A-D are special extracts that Master Cho makes. He has never taught the recipe, and in our testing of them vary greatly from batch to batch. The closest we have come to making them is to put different rocks into what he calls a BMW Machine. Because the minerals are not readily available or consistent, they are not part of the 9 Core Solutions, and instead we advise the use of seawater to get a balanced amount of all minerals, which is nearly identical to Mineral A.
Feel free to dig deeper into this though, there are many references throughout my videos of Cho talking about the minerals.
Water Soluble Phosphoric Acid does help during the change-over period and should be used by advanced natural farmers.
From the KNF library
From the KNF library
Drafted by Claude from Office Hours and the books
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Sep 2026
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8 sources
Drake's answer above covers Mineral A-D. This covers WPA versus WCP.
WCP is calcium phosphate, called KNF Structure. It goes in the maintenance solution. WPA is phosphoric acid, a separate, non-core solution. (Office Hours Ep. 54, 6:56) Drake says WPA is more potent and specialized, so use it carefully. (Office Hours Ep. 54, 26:07)
- WCP: spray on leaves during cross-over and vegetative growth. (Cho, Recipe, p. 65)
- About a week before floral differentiation, add extra phosphorus. WCP or sesame or soybean stem ash both work. (Office Hours Ep. 65, 39:24)
- WPA: apply during the change-over period. It promotes flower bud differentiation. (Cho, Recipe, p. 69)
- Later, WCA assists sugar transfer and the formation of fruits and seeds. (Cho's Solutions, p. 1)
- Cho pairs phosphate with flowering, and potassium and calcium with ripening. (Cho, Theory, p. 117)
You do not need WPA. The nine vital solutions form a complete system, and WPA is not among them. (Pure KNF Manual, p. 32) (Office Hours Ep. 54, 6:56)
The library does not say how to choose between WPA and WCP for a particular crop's flowering weeks.
Sources
- 26:07 Office Hours Ep. 54 (Oct 2022) — Water-Soluble Phosphoric Acid, Chitin, Bare-Root Tree Planting · “phosphoric acid is more potent and specialized, so use it carefully to avoid imbalance.”
- 6:56 Office Hours Ep. 54 (Oct 2022) — Water-Soluble Phosphoric Acid, Chitin, Bare-Root Tree Planting · “calcium phosphate is KNF Structure (WCP), used in the maintenance solution; WPA is a separate, non-core solution.”
- 39:24 Office Hours Ep. 65 (Feb 2023) — Nutrient Cycle, Changeover Period, and OHN Extractions · “Extra phosphorus, such as water-soluble calcium phosphate or ash from sesame or soybean stems, applied about a week ahead.”
- p. 1 Cho's Solutions · “Water Soluble Calcium Fruit. Transfers accumulated carbohydrates into sugars and aids in the formation of fruits and seeds.”
- p. 32 Pure KNF Manual · “these are the basics and together form a complete system of solutions”
- p. 65 Cho, Recipe · “Spray WCP on leaves during the periods of cross-over and vegetative growth.”
- p. 69 Cho, Recipe · “Apply WPA during the Change-over Period. It promotes the differentiation of flower buds resulting in high fertility and yield.”
- p. 117 Cho, Theory · “Phosphate for the flowering period and potassium and calcium for the ripening period”
