Cal/Mag Deficit

Well, magnesium deficiency is still showing up, but it takes a little while to bounce back. I am seeing some yellowing from the bottom as well, perhaps nitrogen deficiency.

It should bounce back. I'm not sure what nutrients you're using so I can't give specific details. In my experience with bottles nutrients, you'll want to feed every 3rd watering.

If I have the correct nutrient % of biobizz cal mag (4.2% ca; 1.7%mg) you are right with the 3.11ml/L to give you 130ppm of calcium. This (130ppm) is the amount of calcium needed in hydroponic grows (dwc / coco) in the flower stage. You could go lower down to 1.9ml/L if you want to once the deficiency is corrected. This would give 80ppm Ca and 32ppm Mg. (You only need 15ppm of Mg). I would water with cal mag every watering if you’re in coco. Calcium is immobile, meaning the plant can’t move the calcium around (it can move N, P and K) so you will still see damaged leaves but new growth should start to look fine. Good luck!

Hi, maybe this helps you recognize it better. In the first picture, it could possibly be a sign, but in the second picture, I don't see it clearly since there are no typical CalMag symptoms. Typical symptoms of calcium deficiency: younger leaves don't grow straight but bend (downward or upward) older leaves develop brown or yellow spots on the leaf tips and slowly die off Typical symptoms of magnesium deficiency: younger leaves initially show no abnormalities because the remaining magnesium is pumped into them older leaves become pale and yellowish (the leaf veins remain green), sometimes with brown spots, and fall off Caution: A magnesium deficiency often only shows up very late. Usually, a calcium deficiency is identified first.