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Ok... so... what I did this week... I moved the plant into the shower and flushed it straight out of the shower. Lots of water. The first runoff was 8.5, I managed to get to 7.9 by flushing. It couldn't be less. So I visited my growshop and bought PH - from advanced hydroponics with phosphoric acid, because the citric acid from biobizz was messing with my PH and EC. I don't have an ec meter, but I had to use a lot of citric acid and it changed the values in the substrate. So I watered with phosphoric acid treated water and managed to get the substrate PH between 6-7, closer to 7. I will continue with PH 6 water and see what happens. After three days i saw the improvement, the yellowing has stopped and the green has returned. I'll see what happens next, I'm just before flowering. 14 hours of light a day and the days are getting shorter.
I read about it, it can be good or bad.. what do you think? I am now trying to solve the PH problem, but nothing urgent. The question I don't want to read is "control your PH" I'm asking about the red color on the branches.
Can be genetic, can be phosphorous related, either not enough or too much......... I have had this a few times in the past and I do not think it affects the plant greatly.............generally genetic related, often in Sativa dominant strains.
I would not be too worried.
A lot of people make a big deal about stem coloration. Alone it's largely meaningless. If coupled with other issues it MIGHT help point you in the right direction regarding deficiency. Looking at the condition of your plant, I wouldn't stress it.
I have soil with dolomitic limestone, I did not know that it reacts with citric acid and increases the PH. Paradox: the more acid I add, the higher the run of water. My solution: replacing the acid with phosphoric acid and adding ammonium sulfate and flushing?Any other solutions?
not how acid base reactions work.
you don't need to use citric acid. if you feel that is a cause use something else. I'd wager that the issue continues. could also be related to your ratio of nutes used in fertilizer. if certain ones aren't at critical levels around roots, the active transport occurring will deplete it and uncontrollable or difficult pH issues can result.
h30+ + oh- = 2h2o - the simplest "AB reaction" in an aqueous solution. The result is 2 pH neutral water molecules and not ever "more" free hydroxide (proton acceptor = base) ph is the log scale of h30+ to oh- ratio.
if you have way too much garden lime, that's more likely to cause what you see. Every promix bale i've used has dolomitic lime in it and have no problems with pH drift or major shifts. simply doesn't happen in 6 years so far. if you self-amended above and beyond, reconsider that step.
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