Yellow/brown leaves

When did you feed her last? From your diary there are several things off for good growing conditions. Your light is only 6 inches away, my 100 watt led is 18" away at this stage. Humidity is to high for flowering and your on the high side for PH. You don't say its an Auto so it is to early for harvest, you've had only 5 weeks of flower from your diary but she looks further along. I think she is stressed from several things so see if you can straighten out all the grow needs. If you haven't feed her for at least a week then she is feeding off herself but if you have, your PH is a main problem, that is if your feeding her properly. Your TDS is way to low but your diary states a low amount for every week, but your only giving her a small amount of water. A 5 gallon pot should take almost 3/4 a gallon and dry out in 3 days, if she's not drinking you may have root damage or she isn't able to transpire properly from her conditions. my current grow is about the same time as yours and she drinks that in 2 1/2 days. You have to rule out all her growing requirements one by one to dial in on the problem, it's not always nutrient related. Good luck

agree with nocone, that definitely looks like advanced senescence. Nothing to worry about. Ur harvest is coming 😉

Looks like a natural fade more than a problem, especially if you’re close to harvest. When both top and bottom leaves start yellowing, the plant’s pulling the last nutrients from its leaves that’s her way of saying she’s finishing her cycle. Check the trichomes to be sure: if most are cloudy with just a few ambers, you’re right on time

npk def

Yeah its a combination of high feed levels and intense light causing burnt edges.. Your not far from the end probably 1-2 weeks, there's still lots of white pistals you want those 98% orange/brown.. Enjoy your harvest they look well juicy..