So I'm in flower, day 35, and one of my plants is not looking healthy. It's leaves forwards the top are yellowing and it has been losing foliage. I have been dealing with spider mites all through out the grow. I also had a sulfur or iron deficiency I believe because I wasn't using open sesame but I got it and it improved a bit but now it seems worse. I'm thinking it may be spider mites sucking on the leaves but I can't find any. I have hot shot pest strips hanging in the closet and I have used dr doom when needed. I question a ph problem. I took the ph on a soil test kit and my ph came out perfect but I hear those aren't too reliable. I'm growing in Happy Frog soil using the ff line up under a 400 watt hps cooled by an exhaust with carbon filter. The third picture is one of my healthier plants for a comparison.
What mix of fertilizer are you using, I know sometimes people use a fert in bloom that's mostly phosphorous and very little nitrogen and I'm pretty sure it gives this type of problem.
i can't say for sure what your problem is until you get a accurtate ph meter. but i would like to say that our setups are VERY VERY similar and i'll be watching to see how yours turns out.
btw, i skip open sesame and cha ching.... beastie bloomz and tiger bloom seem to work just fine if you do very low doses.
I really feel it's the mites sucking the life out of my plant. I removed each plant and cleaned the leaves with paper towels one with just water the other with insecticide. I was wrong there were more mites then I first thought. Digital ph meters are just so expensive. I've used grow big, tiger bloom, big bloom, open sesame, and cha Ching. Beastie blooms is the only one I'm skipping.