Name that Deficiency

[Artstone]

so got home late for 2 nights and missed my lights on time
when I got to see plants they were dry and drooping bigly

i watered and moved into my flower tent since it’s bigger and better light.

i am seeing some weirdness, bent ends of leaves so id think nitrogen toxicity but i dont think that’s so
also twisted leaves, and leaves that the main vein is showing and the rest of the leaf is folded down.

i am wondering if that’s cause of the under-watering but have no real idea. Last watering was 12/10 with about 1/4 grow big, tiger bloom and big bloom feed.

[Artstone]

Also light is 18” at 56 % power and 39000 lux at the top of highest plant. I just moved from smaller light that was 25% and 18 inches so don’t think the % increase would be an issue (?)

new home

[Bluey]

Doesn't look like N toxicity to me.

Hard to tell from that distance but maybe nute burn or potassium deficiency.

Measure PPFD on the plant to rule out light burn.

Edit. I don't think it's light burn. Lower mature leaves dont really get that first.

[Artstone]

Doesn't look like N toxicity to me.

Hard to tell from that distance but maybe nute burn or potassium deficiency.

Measure PPFD on the plant to rule out light burn.

Edit. I don't think it's light burn. Lower mature leaves dont really get that first.

thank you Bluey
My prior wtf post was potassium deficiency, I was leaning that way.

thinking of giving a small feed of full fox farm trio. Like 1 cup to each plant and see if it goes better or worse.

Btw how long does it take to get good at figuring out deficiencies and feeding?

[Bluey]

I use an EC meter to measure the nute strength in my water, otherwise I'd just be guessing.

I stick to a schedule on feedsand adjust a bit to suit. I grow in coco and just give liquid nutes with calmag & PK supplimental feeds from time to time..

You've got to watch your leaves closely for signs of changes and adjust nutes and lighting to suit.