Tacoing and Curling - Light Burn? (F18)

Vegetable

Member
This plant's still quite young, so hopefully diagnosing and getting ahead of this issue early will allow it the rest of a healthy flowering cycle. Six days ago, this OG Alien moved from 4 high-output CFLs to a 600W Viparspectra LED. The light hangs about 18-20" above the plant (manual recommends 18" for flowering) but after watching some leaves curl and fold up over the past few days, I've become worried that I'm witnessing light burn. I moved the light up this morning, so there's now about 25" between the light and the top of the plant. I also administered a very light foliar feeding (H20 + CaMg).

I'm thinking that this is also a case of pH too high, locking out Mg, and predisposing the plant to other issues. I use the tie-down method, which could be contributing to stress. Temps average from 22-28°C and wind is definitely not a factor in the problem. Of course, I'm looking to this community for your expertise and advice - maybe someone will see something in this that I haven't thought of. Am I looking at cause for a flush? Last watering went in ~6.3 and runoff was ~7.2.

Growing in soil and feeding organic nutes with a feed/water/water schedule. Blurple photo from yesterday, the rest are from today.







 

Lite

Well-Known Member
The fan leaves are nitrogen starving, they are pulling nutrients out of the leaves, while at the top it looks like they are burning.

Flush your salts out of the roots, oh just saw u said thats soil.

Yeah, I am wiling to bet you that you have heavy salt buildup on your roots and your soil PH is probably way off. Flush with 6.2-6.4ph water for 3-4 runs. If you have anything like fox farms "sledgehammer" or any other salt flush that will help you.
 

Vegetable

Member
Tested TDS on some runoff and it was way too high. The plant was re-potted recently and it seems that the slow-release worm castings were under-estimated. I flushed down to 570ppm and raised the light even further. Updates to come
 

Jestone

Member
I'm curious how things have been growing since you re-potted and raised the lights. How's the new growth looking? Less yellow and twisted? I've been having a similar issue with some first week into veg clones.
 
Top