If I roughly calculate the NPK levels for subcools recipe, I find that it has about 230-250 grams of N in it, with a NPK ratio of about 20,5-1.Subcool’s Super Soil Recipe Improved, Small Batch :
- 1 ten gallon bag of high quality Organic Potting Soil Such as “Roots Organic Soil”
- 3 to 6 pounds of Organic Earthworm Castings (1 lb. of casting = about 1 gal.)
- 10 ounces of Blood Meal ( 10 oz. of blood meal = about 1 & 1/2 cups)
- 10 ounces of Bloom Bat Guano ( 10 oz. of guano = about 1 cup)
- 10 ounces Fish Bone Meal ( 10 oz. of bone meal = about 1 cup)
- 6 ounces Rock Phosphate
- 1&1/2 tablespoons Epsom Salt (magnesium sulfate)
- 2 tablespoons or 1 oz. (liquid measure)of Dolomite Lime
- 1 tablespoons or 1/2 oz. (liquid measure) of Azomite (trace elements)
- 1 teaspoon of powdered Humic Acid
For me that is a veg NPK ratio.
In general I go for a 4 : 1 : 6 ratio when vegging, with N=170 mg/L and for bloom a 1,4 : 1 : 2,2 ratio, with N=160 mg/L, when using liquid ferts.
Say I grow some sativa dominant plants for like 84 days. That would be about 28 waterings. Say like a liter (quart) of water a time. That would be about 5 grams of N in total.
So 1/3 of 5 gallon is 1,6 gallon. Subcools recipe is about 10-15 gallons of soil with 230 grams of N. That is about 30-35 grams of N in the bottom third of the pot.
So is the N in Subcools recipe so slow in releasing N that it only releases about 5 grams from about 35 grams of total N in 84 days?
If I would design my own supersoil, what NPK ratio should I aim for? Veg ratio or bloom ratio? There is no repotting I think in supersoils. Or can you?
What levels should i go for with N. Subcools levels? 30 grams of N per pot?
BTW; i smoked some and became obsessed. I have no clue if these calculations are correct