Leaf yellowing on my little monster

[giannoulis]

Hi everyone.
I‘m having this plant problem in my little SCROG setup. NL#5 Haze, 7 weeks into flowering. 400w HPS and 170W LED. It’s not on every leaf, but it started showing up and since I‘m going for a one pound monster, I want the best grow I can have. I noticed that some cola tops have turned white from light bleach and I have moved up the lights a bit, trying to find the best balance. but could that have to do with the leaf yellowing?
thanks

 

[GreenGenez421]

How many weeks are you planing to take her? You should have started to fade already with the chlorophyll at 7 weeks and secondary pigmentation either carotenoid (yellow, orange) or anthocyanin (purple, magenta, blue).
What I'm seeing is overfeeding and your nitrogen values have remained high hence the lack of fade. Keep the lights higher than before so you don't encourage light burn or the white tips. And give plain pH adjusted water until harvest. Remember just because the leaf isn't green anymore doesn't mean it's not undergoing photosynthesis. If it's brown and crispy (necrotic) then the tissue is dead and useless and should be removed. If not necrotic but with secondary pigmentation, leave it and don't worry. And lastly, and this one should be obvious but I'll specify anyways, only remove leafs that are truly useless, a little necrosis on a leaf doesn't mean the leaf should be removed.
Oh, also.....give some molasses or agave nectar as a carb load with your plain water. The carbs will help bulk up the calyx during the ripening swell.

 

[GreenGenez421]

GREAT JOB ON THAT CANOPY!!!!!! THATS A TRUE SCROG!!

 

[giannoulis]

How many weeks are you planing to take her? You should have started to fade already with the chlorophyll at 7 weeks and secondary pigmentation either carotenoid (yellow, orange) or anthocyanin (purple, magenta, blue).
What I'm seeing is overfeeding and your nitrogen values have remained high hence the lack of fade. Keep the lights higher than before so you don't encourage light burn or the white tips. And give plain pH adjusted water until harvest. Remember just because the leaf isn't green anymore doesn't mean it's not undergoing photosynthesis. If it's brown and crispy (necrotic) then the tissue is dead and useless and should be removed. If not necrotic but with secondary pigmentation, leave it and don't worry. And lastly, and this one should be obvious but I'll specify anyways, only remove leafs that are truly useless, a little necrosis on a leaf doesn't mean the leaf should be removed.
Oh, also.....give some molasses or agave nectar as a carb load with your plain water. The carbs will help bulk up the calyx during the ripening swell.

Thanks for your reply and sorry for the late response. I ve been growing the NL#5 Haze for a couple of years now and I know it takes about 11 weeks until she’s ready for harvest. I have been using Advanced Nutrients forever and I have been following their schedule. According to this, I would have to feed her for 2 more weeks. And here’s the question: You suggested not to feed her anymore. Would that help for a bigger harvest? Or is it just for overall plant health? For the next run, would you suggest to feed 1/2 or 3/4 strength? I‘m not getting paranoid with a brown leaf here and there, I just don’t want a small crop. I‘m defoliating heavily during veg and during the first 3 weeks of flowering. Here’s how she looks today.