Calcium Phosphate (bones/vinegar) vs. Phosphoric Acid (sesame stems/water) will one replace the other, is one input older?
Top answer
From the KNF library
Drake's library treats calcium phosphate and phosphoric acid as two different solutions. (Office Hours Ep. 54, 6:56)
Calcium phosphate (WCP) is a core solution, used in the maintenance solution. Phosphoric acid (WPA) is a separate, non-core solution. (Office Hours Ep. 54, 6:56) WCP is used constantly. WPA is more potent and specialized, so use it carefully to avoid imbalance. (Office Hours Ep. 54, 26:07)
Cho's book gives this timing:
- WPA: apply during the change-over period. It promotes flower bud differentiation. (Cho, Recipe, p. 69)
- WCP: spray on leaves during cross-over and vegetative growth. (Cho, Recipe, p. 65)
- WCA, the calcium fruit solution: it aids the formation of fruits and seeds. (Cho's Solutions, p. 1)
The sources differ on WPA. One Office Hours answer says use it only for phosphorus deficiency. (Office Hours Ep. 17, 45:11) Cho's book lists change-over use. (Cho, Recipe, p. 69) A week before floral differentiation, one answer offers either calcium phosphate or sesame or soybean stem ash as the extra phosphorus. (Office Hours Ep. 65, 39:24)
The library does not say which input is older. It does not give your three-step order.
Sources
- 45:11 Office Hours Ep. 17 (Feb 2022) — Biochar Activation, Fish for FAA, and Fruit Sweetness Formula · “a Master Cho recipe outside the nine core solutions used only for phosphorus deficiency”
- 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.”
- 26:07 Office Hours Ep. 54 (Oct 2022) — Water-Soluble Phosphoric Acid, Chitin, Bare-Root Tree Planting · “Calcium phosphate is used constantly in the maintenance solution, while 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.”
- p. 1 Cho's Solutions · “Transfers accumulated carbohydrates into sugars and aids in the formation of fruits and seeds.”
- 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. 65 Cho, Recipe · “Spray WCP on leaves during the periods of cross-over and vegetative growth.”