Problems with first autoflower day 38

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Hiya I noticed alot of yellowing on my leaves over the last 2 days along with slowed growth am wondering if anyone with more experience has any idea what the problem could be. I'm growing in bio bizz lightmix soil with mars hydro 300w eco light and greenhouse powered nutrients, am watering when it seems needed, was looking healthy to a couple of days ago so not sure what's happened, have got temps of 69-74 and humidity at 48-53%. Any help much appreciated will attach some pics
 

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Hi, I’m not an expert (only on my 3rd grow). But to me looks like advanced Nitrogen deficiency. You should re-post this in the infirmary section where someone with a lot more knowledge will answer your post (you don’t find as many members lurking in the seed producer section).
Also this might help you:
108CB562-11AD-4893-8F8C-196BF09CFBF5.png
108CB562-11AD-4893-8F8C-196BF09CFBF5.png
 
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