Plants dramatically yellowing

@gmslave I'm growing organically in soil, for now I have just checked the ph of the waterings and adjusted it to 6.5 each time, I can start check the runoff ph but for now I don't have the pen for the EC, 'cause organic nutes don't affect the EC of the water you use for irrigation. Do they affect the runoff water EC? If so it can be worthy buy one pen monday in my local grow shop

Make sure your pH and ppms are good. You could add bennies as well if you want to be overly cautious. Tilt your pots to the side and give them a semi-hard WHACK to see if any critters come up. If all of that turns out good, just watch over a few days and if it doesn't get worse, then you're good. I don't recommend adding more nutes, it doesn't look like p or k issues and n isn't needed much in this stage. As a last resort, flush her out.

Root bound in flower isnt a baď thing. If you're not sure of what it need a check of your runoff ph and ec is what needs to be done to see whats out of whack, ph or ec. If you haven't got a tds ph tester its worth the cash. That is the way how we successful growers grow big bud. By keeping check of runoff and adjust as necessary., before the plants suffer. Cheers friend