Well, I might be getting this figured out, only time will tell. More on that later, for now; GCA Pics
Quite a bit going on with this gal but at this point, just want her to finish. This is actual day 62 from sprout but it’s developmental age is more like 48 days. Day 25 of flowering.
I backed off the nute strength a week ago because of the burnt tips but frankly, I am ratcheting it back up as she started to yellow a bit more though that is likely natural to a degree.
So now on to BBA 1&2
Today I spent some time researching what another grower suggested after seeing my pics, possible mag deficiency.
I researched this and given that calmag has been added to every gallon of water, I went back to the initial place, pH. I agreed that mag deficiency explains the tiny twisted growth and it’s not uncommon in coco to have a mag or cal problem.
Since mag is in the mix, I looked at the hydro ph chart and began to experiment a bit. I calibrated my pH meter and got out the reagent drops and chart. Long short, things were not adding up. I recalibrated and checked some controls and still had low 5’s coming up for ph when I used the drops. Not just in this res but in my GCA res.
Back to the computer for more research and “viola” there it was. I’ve been messing up my whole grow by adding pH up/down to the AN Ph Perfect Technology nutes. Big no no. Not going to get good readings based on standards charts and beliefs. Mix it and forget it. I suspect @WillyJ is not messing with the ph??
In my defense, I was not adding ph down initially but was getting a bunch of skim, scum, slime and white crap in my res. Turns out if using silicate (i was) you must balance ph after adding it or it coags and will not dilute properly.
So, I threw out all my mixed nutes (which I added a ton of ph up to to try and get a 6 reading with drops) and started fresh on all three plants. This time, no ph down or up or nothing and “viola” the pH is 5.9-6.0.
I think I was forcing the pH too low by adding ph down and locking out mag. Time will tell. BBA1 look terrible today and asked not to be photographed in her condition. I respected that…stay tuned.