Thanks for your reply @Masterdank420.
Are you using cal mag? Or another calcium source? If you are using calcium nitrate I suggest phosphorus deficiency.
and a little Mg wouldn't be amiss
No, not using Cal Mag. I get my Cal from Jacks Part B Cal/Nitrate and Mag from Epsom salt (Mag Sulfate). So, should I reduce Cal Nit, and somehow find another source for Phosporus? What's a good cheap source?
I am not familiar with the way you grow, but it sounds like you have hard times with proper treatment. Before you start to mess with jacks which is used by lot of growers with great results I would suggest to correct that first. That leaf looks like pH issue, but diagnosis based on one single leaf given on the table might be missleading. Good luck!
I think that the problem is still PH. Calcium nitrate raises the PH and you are growing in rockwool which is naturally alkaline.I think you may have inadvertently locked out nutrients this way. your runoff is a little high at 6.8 for Rockwool. I'd lower the PH to 5.4 with every feeding. You never want runoff to exceed a PH of 6.5 in rockwool.
Don't change the 321 recipe. Do consider pH. The calcium nitrate has more than enough calcium already.
I would like to try it once, but it's not really an option for me.
Por que no?
between 1.4 and 1.6. Runoff is coming out at around 2.1 to 2.2.
by soil, I assume he also means full organic. I know nothing about that growing method. I would love to learn, but don't have the time or extra money to go down that route.
Meaning even peat based medium.
