Discolored and twisted leaves

The small leaves around the bud sites on all of my plants have started to turn dark and become twisted. The large leaves are not at all affected. I'm using the Lucas Formula, so this *shouldn't* be a nute use (but I'm not rulling that out). I just discovered this morning that the res temps are too high, so maybe that's the issue.

Grow Details -
DWC Drip Feed Hydro system
Lucas Formula - GH based nutes - flowering profile - 920ppm
pH - 5.6 and stable
6 - 42w "soft-white" CFL's over each plant; 2 - 26w "soft-white" CFL's in front
Room Temp - 84 average; 88 high; 79 low
Res Temps - 82 :wtf:

Any thoughts or suggestions would be appreciated.

yes i agree high temps , i had a very simmilar outcome white some widow when my temps were raised to the near 90's.

I believe your on the very edge of nitrogen toxicity

heat :smokin:

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Originally Posted by Ganja Guerrilla

I believe your on the very edge of nitrogen toxicity

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Yeah, I wondered about this last night, actually. In *theory* this shouldn't be possible using the Lucas Formula, but.......

I know that having reservoir temps too high will lock out nutrient absorption. Assuming that P and K have maybe been locked out, could that account for the nitrogen toxicity?

heat doesnt make new growth overly dark green, but nitrogen does


lots of photo examples at my site ....look in fert burn sections & Miracle Grow sections
Web Gallery Wizard™

the dark green could have been there before the leaves started curling, and since he's in flowering cycle, unlikely he is adding nitrogen, that being my reasoning, as well ... :smokin:

I vote for N tox as well.
However I also see single bladed leaves that don't look like 'sugar leaves'- are you certain you do not have any light leaks?

additionally if it were heat, the leaf margins would curl Upwards to conserve transpiration

Quote:

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Originally Posted by the image reaper

and since he's in flowering cycle, unlikely he is adding nitrogen, that being my reasoning, as well ... :smokin:

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This is not a correct assumption. As I said, I'm using the Lucas Formula for my nutes.

During flowering it calls for a 0-8-16 ratio (in ml per gallon) of GH FloraGrow, FloraMicro, and FloraBloom. The FloraMicro's NPK numbers are 5-0-1 (along with a bunch of micro nutrients), which means every time I top off my reservoir I'm adding some nitrogen to the system. Not much, but some.