Yellow leaves?

I agree with Growing Grannie, my plants are in week 6 of flower and are way further in the deficiency. I tried adding the nitrogen first and the cal/mag with not really a good reaction. I’ll definitely be investing in a PH pen so I can check my runoff and some PK booster. The Strawberry Fields was very hot in phosphorus which is why it totally makes sense what she said. My buds aren’t looking affected I guess because I usually have a decent runoff. Definitely start on the low end of the nutes application as I learned on this grow of mine also. Good luck 🍀💯👊🏻

Thank for the answers! Tomorrow i'll check the runoff Ph, but i have another theory for you, it's happening on only two large leaves right above where the branch snapped could it be the reason? all the other leaves are perfectly green even the ones below these!

This is not a nitrogen deficiency at all - in fact, this may be a nitrogen toxicity but I'll get to that in a moment. The yellowing leaves are showing all the signs of a phosphorus deficiency so the plant is crying out for more PK... One of the causes of this is a pH that is not in a good place - but yours is spot on... but the pH at root level may not be good... so check the pH of your runoff to see if that's where the problem lies. Phosphorus deficiencies will first start to show up as the plant goes into flower, which yours is... and it may also be combined with a calcium deficiency... so I would suggest adding a dose of calmag once a week and some additional PK... if this doesn't seem to be working (if the problem continues to grow after a couple of days to a week, it's not working), then I would tell you to do a flush adding in 1/2 strength nutes to the last gallon of pH'd water you put through as a flush. I would also suggest that you keep the BioGrow at 1/2 strength going forward from this (plants in flower need less nitrogen than when they are in veg although they do need SOME)... If you want more information or to really diagnose your plant (because you know all the particulars), read this article before doing anything... https://www.growweedeasy.com/cannabis-plant-problems/phosphorus-deficiency Good luck!

Looks like a possible Nitrogen Deficiency. Expect more leaves to start yellowing if The deficiency isn't corrected within a week. The yellow leaves will not turn back. I'd say double the frequency of Nitro feedings for a week and you should see improvements. The plant looks healthy otherwise, I'm not familiar with the fertilizers you're using but I don't see anything with nitrogen in it in your grow diaries, and the Top-Max may be another issue. Top-Max seems like a flowering booster (you're vegging now), and it also has Calcium and Magnesium. I've had issues in 2 grows with finicky autos and Cal-Mag solutions. I'd be careful with Top-Max (again not familiar with the product I'm going off experience and the product description)