heat / light stress maybe?

drcucumber

Well-Known Member
This is a strain called custard cream, grown in soil under a 400w HPS, using biobizz nutrients.
Currently just hit week 4 of flowering. Within the last week i saw this yellowing appear and it is continuing to progress day by day. I have tried to upload photos of the leaves at various stages.

The yellowing is more pronounced near the light, plus it looks a lot like the examples of light stress here http://www.growweedeasy.com/cannabis-light-burn , so my theory is light stress.
I don't know temperature but there is an excellent chance it is too hot. I also don't know ph, and i know I should start measuring these things.

i have flushed, and moved the light back. I am expecting the slightly damaged leaves to just continue to yellow out and die even if i have fixed the problem. So it might be hard to assess. DSC_0354.JPG
 

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Bugeye

Well-Known Member
Yeah, start measuring shit so you can diagnose better. I'd guess a nute lockout of some variety, be it nute antagonism or ph I don't know. You have adequate drainage?
 
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