need help with huge northern light lady

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Ok I have experience ive learned alot over 2 years the last 6 months been dialed in growing 100g girls and one 246g girl. I dont get nervous much but after haveing the type of success ive had I know I need to fix fast to get next level results and this girl seems like she might be the best yet. So the problem is yellowing started on lower leaves they went yellow then died fast im thinking a cal mag lock out but if im correct I dont want to add cal mag until I fix the lock out, any ideas if im rite can you see anything different. Fox farm ocean forest, fox farm tri 5 gal bucket 8 weeks old, she was under a scrog net until last week, 600 watt hps. Thank you
 
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I'm no doc, but its looking like more than cal mag. Judging from those leaf tips. That looks like N - def. but it could be a lockout related issue. Again no doc, but N def usually affects the lower leaves, from the outside in... I'm sure @Waira will be around soon...


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:toke:--- Oy, have you checked the soil pH, and what your inputs are pH'ing at? FuxFarms has been horrid shit for many lately, with half cooked badly acidic soils,... that said, if it's all lower leaves, light starved, and likely tapped out for their N as well, like GB mentioned,... I need pics, not in HPS please, to confirm,.. this lights' color rendering is lousy for diagnostics!
 
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Ok thank you for getting back to me so fast I will get pics up tom morning im away with work, horrible timeing to have to leave. I have no way to check the soil ph, but I do have a great ph pen and alla my water and nut solution going in is at 6.3. I also have to use a tom of ph up when useing the grow big and tiger bloom. My guess is theres about 5 weeks left til there ready if I compare to my other grows of this strain so theres not alot of time left to dial in these issues, I know that if its not fixed asap this is the most important bud formation time and this girl has a. Chance to breaka my personal record of 264 dry. I will get natural light pics up asap
 
I learn SO much from spending time in the infirmary. Just 2 months ago, I was a wee lad just popping my first beans. But, I love diagnosis. Too bad, I haven't been growing for so many years like, @Waira. One day at a time. HAHA



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Ive never cleared out a plant before. I also had to remove the net cuz I cracked a main stem, I taped it up and it seems to be working well
 
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