Bottom leaves yellowing in flowering

Note that that is the normal feed according to half strength nutes (since shes an autoflower) last feed was at 1/4 strength but the yellowing started before that I think

It also happens to the lower leaves that dont touch the bucket

Hello thanks for all the responses, I added pictures of a online ppm calculator to last weeks diary, also did my own measurements (but the ph and ec meter are kind of cheap) Tapwater: pH 7.9, EC 0.465 Water with nutrients: pH 7.17, EC 0.898 Water with nutrients and ph min: pH 6.1 (goes up a bit in the next hour or so, this is right after adding and stirring so not really accurate), EC 0.931 The bucket is both for fun and practical, as I have the plant in my bathroom (the electronics dont get wet dont worry), so I needed a relatively small ez to move container for it. Growing the plant is mainly for fun, we just got bored and thought why not?

if you cut back on feed... N-deficiency seems likely. Te impacted leaves are visible when looking into bucket, so they are getting light. how much are you providing at moment? use a nutrient ppm calculatore.. simply type in teh % off label and it'll tabulate it for you -- note the standard used for P/K .. believe great britain and or EU use a slightly different method? is the bucket just for fun? careful of the multitude of gimmicks out there... a smaller plant might work better in that bucket. might be good to trim back foliage that is touching the sides. but only a guess.

Maybe nitro deficiency but id say it looks more like lack of light as they are bushy

It looks like nitrogen, but your growing in a lined bucket and don't know what that does for leaves touching the sides. Maybe a false positive. I've very new to that type of growing even though its like a mini tent. If you use a TDS pen in your nutrient solution post the EC, it may give a better understanding. Good Luck!

Because your growing in a bucket (much respect for that) the lower leaves won't be getting the required light.

Your guess sounds correct to me. Lack of N. But it could also be a lack of light making it to the bottom of the plant and it using up the leaf as it is no longer useful.