Plants are about 50-60 days in , they are auto flowers, and starting to get brown spots in leaves? I used the floramix for nutrients.
I'm having the exact same problem with my autos at day 43. I thought it was a calmag deficiency, but I got this answer here yesterday "If you recently finished the stretch portion of flower I'd think the plant pulled extra nitrogen, the splotches favor phosphorus deficiency however if you're just seeing the issue on a leaf or 3 with as many as you have I wouldn't worry too much. If the plant was riddled with deficiency that would draw concern If you ever do have magnesium deficiency it depends on nutrients you're using which method would be best to treat deficiency. If using liquid fertilizer go with a calmag solution, if using amendments use Epsom salt 1tbls per gallon of medium. Also good during veg even early on to give Epsom salt foliar sprays, once a week to every other week 1 tbsp per gallon of water." Hope this helps!
Completely different situation, this plant shown looks like nutrient burn but as stated above more information is needed to give proper assessment.
I used the Miracle-Gro potting mix and feed the recommend mix on the floramix bottles whenever the soil goes dry, I tried to do nutrient feedings every other watering but whenever I did that I noticed the leaves start to yellow , so I just water/give nutrients every 2-3 days
Lots of growers have issues using MG mixes to grow cannabis. Probably should have just upped the amount given and not fed every watering. Only people that do that grow in coco. Any kind of soil mix you'll run into nutrient build up feeding that way. You could start getting run off readings using plain water to see what your medium looks like ph and ppm wise before doing anything else. Being autos you'll need to tread lightly anything preventing growth rather plant or bud will hinder yield. Regardless of plant type auto/photo being in flower should cause extra caution to not stall the final push. Pick is for ppm feeding and run off reference, meant for photos so could be viewed for autos towards the lighter end. Personally I use happy frog to start in then transplant into ocean forest those autos dont need food for up to two months. Good luck