Deficiency?

New to RIU. Have posted pics in mj plant problems. No response. Please help. Leaves are wrinkling turning to be dead. In the don't post pictures with a hps or led on thread. Last post

Your plants look awesome, the purple stem could be from nitrogen magnesium and one other but i think u should keep doing what youre doing

What about the wrinkling of the leaves, discoloration and then the leaves dying and turning black? It's all over the one plant 2 weeks into flower

The last pic looks like overwatering doing it so often the leaves might be wavy can you take a picture of where you think youre having issues? Whole plant shot is nice but hard to see what youre talking about

Does this happen at the top of the plant also where the warmth and high light is? or are the leaves perfect and not thin wavy up there and totally normal?
It looks maybe to be overly saturated medium, combined with low light levels down there.
is one issue.. maybe..

Started on bottom leaves now is all the way up to top

Maybe you have a disease? a fungus or something.. i think i see wierd spots or something in some leaves in the pics? like rust?
??

If this is a possibility I would emedietly make a 18hr brew of {3-4 tablespoons worm castings + 1tablespoon Unsulfered blackstrap molasses per 1gallon of water}... and foliar spray her all over 'liberally' with it... and water it in her roots also, and do this for the next bunch of watering, foliar spraying her with a new tea every few days.. getting the underside of the leaves very well also and finding good part of the day where the plant will dry good and fast, not before/at night, or morning dew time etc. considering if it is a fungus disease taken hold dont need to add moisture at moist times and help disease. If it is disease, worm casting microbes will outcompete the availavle micro space and out populate the other bad organism's space. Also there is chitin in worm castings which will help the plant to activate immune response stronger and plant could begin isolating the infection blocking it from feeding and it will die off, and why applying the tea multiple times in a row is benefical (it cannot burn!), it will pack all leaf surfaces with benefical bacteria and fungus taking up all available space and protect the plant.
This is, if it is a fungus/pathogen/disease of some kind. I don't know.
You may have something eating your roots also, now that i think about it.. what those wierd spots on your leaves are.. looks like some kind of rust.. but could be sign of something munching down below.
Just all guess man.... I don;t know.

(Is your humidity day and night in check? Did some shit take hold due to RH issues / weird swings / or too much? This is my thoughts... just trying to give you some ideas.. not enough information.)

Only this plant is doing this. The others look lgreat. Same strain. Same everything.

This may be Calcium deficiency, but is the plant just deficient in this mineral, or is there lots of Calcium in the medium but it is locked out from the pH being out of whack?? This is what you need to know.

Do you use RO water by any chance, if so, maybe this plant likes higher overal EC/ppm, or just higher Calcium and tap water is called for here..
or extra CalMg product with main food regimen.
??

or pH is off... test the runoff water from that plant and see if pH is much lower than what you put in, if it is, then Calcium is locked out. Calcium has hard time at lower pH, even if it is present.

CalMg bro

Final answer.

Use it.

Thank you for your advice.

It's just educated guess, not 100% but I hope this works!
...and my main reason for this msg is
remember, things can take a few days to see results one way or the other.

Good Growing!