The top leaves on this skunk have started to curl inward like a claw and develop brown spots on the leaf i just added a c02 burner to my room and this is when the problem started my room temps stay around 80, my ph stays in the 6.0 to 6.5 range my grow medium is coco i keep the c02 level around 1200 ppms and my nutes at the same concentration. the browns spots on the leaves i have seen before near the end of the grow but never this early the leaf curling is new . I thought it was a n def due to the color of the leaves under the light they look pale green i added extra n and there dosent seem to be any change now i wondering if its a nute burn or maybe a nute lockout any help would be appreciated.
Hmm... top leaves, check. Brown necrotic spots, check. Coir, check. You have a few issues, first and foremost is a Ca-. Ca is important for all plants, but even moreso in hydro and especially in coir cultivation. Also, your pH is out of range IMO.
Edit* Still true for hydropebble cultivation, IMO (but not experience, never used those things yet). I still think your pH levels are way too high, and it's clear that you've got real issues with calcium. I would suggest getting a Ca-only product, dropping your pH. Also, whole plant pix are most helpful.
In the meantime, I'm going to attach for you three charts, one is a flow chart and demonstrates the importance of knowing
where a given issue is being observed on a plant. The second is simple cannabis leaf depictions, it does have one mistake as it shows Ca as being mobile, calcium is an immobile element (which is why it shows up on the newest growth--it cannot be translocated from old to new plant tissue). The last one is the Mulder Mineral Wheel and shows how minerals are synergistic or antagonistic to each other, with elemental notations. I use these charts ALL the time.
