if they’re stressed to begin with throwing more nutrients on top of the stress will not solve the issue but compound it imo however i also don’t think 750umols is an overkill (if thats the actual median op sees) but most plants need acclimatisation as indoor stock thrown under the summer sun will burn first then gonna grow out of it (the uv is not the only culprit there) so if the op would first dim the lights a bit and it works he can then gradually turn it up and this way he doesnt create unneccessary stress for his plants and he can adjust feed etc and stop again if same symptoms appear. easy.
My apogee meter reads 1020 umols at the absolute highest part of my canopy, with most of it sitting between 600-800 and the corners dipping to 500.
My runoff PH after flushing is sitting at 5.0, which is a decrease since earlier. The top of my soil is at 6.8ph when I tested it in a 1 to 1 mix with RO water.
I typically grow in hydro but decided to give soil a try. I have no idea wtf is going on in the root zone or why I'm showing some deficiencies. I don't know if it's a PH induced lockout or what.
I've also basically drowned the plants over the last 5-6 hours but they are still praying hard.
Oh, and this is week 3 of flower. I should have said that before. Strain is Shiskaberry by Barney's Farm.