Deficiency? Or plant self pruning?

Pictures below. Thoughts? Only affected growth is the lower portion of the plant. Plant height about 4-5 foot. Bottom foot of the plants in the room seem to be doing the same thing. Upper 2-5 foot luscious green.

Tip - you won’t get any help with your HPS light on. We can’t tell anything from HPS pics. Please take pics in natural light. Flash on or off whatever helps get better pics.

Got the same problem in my hydro grow https://www.rollitup.org/t/lower-leaf-drop-day-9-of-flower-in-hydro.1051317/

Great photos

what exactly am I looking at here?

will take better pictures on lights off thanks for the replies.

Do you have HPS glasses? I recommend them so you can see the deficiencies without pulling out every plant.

Do you know the soil ph by chance along w ppm and ph of said soil? A slurry test will be needed. To me it looks like you have hit her hard with nutes. See how some of them are canoeing on you..

MustGro said:

Got the same problem in my hydro grow https://www.rollitup.org/t/lower-leaf-drop-day-9-of-flower-in-hydro.1051317/

Click to expand...

Magnesium deficiency...

MustGro said:

Got the same problem in my hydro grow https://www.rollitup.org/t/lower-leaf-drop-day-9-of-flower-in-hydro.1051317/

Click to expand...

Magnesium deficiency. Cal-mag deficiency go hand in hand.

The Real Medicine Man said:

Magnesium deficiency...

Magnesium deficiency. Cal-mag deficiency go hand in hand.

Click to expand...

Well they're getting 1 gram of magnesium sulfate (epsom salts) per gallon of solution for a few days now since I switched to Jack's. They look better but I trimmed some lowers. I'm hopeful they're gonna do well.

Okay deducted that it wasn’t self pruning. What do you guys think?? Temp is @ 80F. Rh is @ 50%. Notill 25 gallon fabric coots mix. Second cycle. Top dressed 1 tbs kelp meal per 5 gallons of . 2 tbs fish meal per 5 gallon. 2 tbs neem meal per 5 gallon. And about a gallon of homemade worm castings top dressed on top of the pot. This is the recipe I used to make the worm castings out of garden compost and amendments.

#100 gallon pot of compost: 2 lbs of each amendment(Neem/kelp/fish meal) + 8 lbs of basalt + 8 lbs of gypsum + 8 lbs of OSF

Possible nutrient burn?? Nutrient burn didnt show when plants were younger. I vegged them in these 25 gallons for about 10 days and they are about 2 weeks into 12/12.

Looking like nutrient burn, fertilizer salt buildup does the same thing