Just curious why all the potassium sources? Langbeinite is 0-0-22, Kelp is 1-0-4 and Potassium sulfate is almost 50% potassium. Not to mention it’s a salt based chemical nutrient. Plus, if your soil has EWC in it, most of them have a pretty high Potassium level in them as well. Excess K in your soil causes a lockout of Nitrogen as well as Magnesium and Manganese. I believe it can also have an effect on Phosphorus uptake as well. I found out the hard way. Lol. Balanced soil is the key. Soil with lots of biology in it only needs ‘enough’ nutrition for the plant. Loading up soil with excess nutrition is a carry-over from salt based chemical growing. A soil test could be very useful if you added all those ingredients. FWIW - if you have a soil test run on some of these ‘super soil’ recipes after a full cycle, you’ll find there’s still plenty of nutrition remaining in the soil, unused by the plant. Only a few things may need replenishing. I think they were designed before we (as a community) understood the importance of biology - in an attempt to get enough ‘available’ nutrition for a full cycle. Before we paid attention to biology, our souls didn’t have adequate levels of biology to unlock the nutrition and make it available to the plant. Now, though, we can easily and cheaply add the biology to make efficient use of much ‘cooler’ soils for successful complete runs/cycles. A good cannabis soil recipe would be more neutral naturally (from its components) and wouldn’t require a forced acidification to correct the pH.
Also, since we’re in the organic section, I wouldn’t worry too much about just pH. The key, again, is biology. IF you load your soil with beneficial microbes and fungus they will regulate the soil pH, with the plant’s help, around the rhizosphere. Growing organically, I’ve found that just about every nutrition issue I have had has been solved by throwing more biology at the soil; assuming I started with a well balanced soil to start with. If you’re creating your own soil recipe then testing and fiddling with the overall pH will be important; but if you’re building your soil from a well-known recipe or kit, the issue of soil pH shouldn’t be a worry, IF there’s sufficient soil biology present. Sulfur will certainly lower your pH but the question I’d be asking myself is, “what did I do wrong with my soil recipe to end up with such an alkaline soil?” That way you’ll know what NOT to do the next time you build a batch.
Hope this helps and good luck with your grow!
