Yellowing leaves in flowering week 8

If you mean week 8 of flowering and not week 8 of the plant's life, it could just be fading.

Give them a good flush and leave them on water for 2-3 days then get Ur pH right and Ur ppm right and keep checking it every second day to make sure it's spot on. Take Ur time with it its worth every min u take to keep this spot on. I have found that mine went best at about 6.1ph and 1000ppm

I agree with everything NobodysBuds says!

Hey mate, Im not a professional but i think it might just be because of light, how close it is to the plant. Because the leaves at the bottom usually doesnt get enough light and could fall of usually some growers chop the bottom leaves off so the rest of the plant can get nutrients then it going to waste. Or like the guys said above could be overfed, but personally it doesnt look over fed with nutrients majority of your plant looks good. Maybe just do a flush just to be safe and reduce the dilution amount from 3ml to maybe 1 and see how it goes, little goes a long way. Also try LST (low stress training) i think you defo benefit but you have to be carefull with it. Plant looks great still , happy growing

bottom-up = mobile nutrient. interveinal chloosis... Fe deficiency symtpoms, but could be lockout from too much K too. any spots on upper leaves? is this same as in diary? looks pretty isolated to the bottom. are you allowing any sort of dryback up top? top 1" should be dry before irrigating again. mottled older leaves can happen on their own too. irrigation habits could be part of it. looks like a 1gal pot or smaller? while i don't think it's a cause at moment, your oots will get tight in a small volume and it will make the plant tougher to keep happy/healthy at some point before the end. need more info to give a good solution. your diary plant looks healthy, relatively speaking. a few leaves shedding at bottom can be no big deal. Soil has unknown amounts of nutes, so it's hard to be definitive on what you should do... if the problem is moving slowly, don't do anything too major. small changes are easier to reset, if wrong... easy to see if they futher slow or alleviate the issue. if it's developed further up the plant than what is shown in diary, i'd dial back for a fertilization or two and observe and react from there. if it's only the bottom couple nodes shedding, i'd ignore it. i don't see a need to flush... simply adjust your feed and carry one.. maybe get a little extra runoff with any water-only irrigations between fertilization and that;ll knock it down a peg on its own.

High bro, I checked your diarie and the Jack Herer strain is a great choice I also grow this one myself right now. Your problem with this plant is overfeeding. Lucky you can solve this problem pretty easy with flushing the soil. You can do this flushing by slowly pour water onto the top of the soil, allowing it to drain freely from the bottom of the pot. Pour slowly, so the water doesn't overflow from the top of the pot. Use approximately four times the pot's volume in water to flush the soil. For example, use 1 gallon of water for a 1 quart pot. After the flushing you need to let the soil (almost) dry out completely. Then you can start giving only 1ml/L instead of the 3 ml/L that you give now. You can slowly up the amount of nutrition with 0.25 ml/L per week till you reached 2 ml/L then this should be enough till harvest! Happy Growing! 😋

Either a lack of nitrogen or natural defoliation due to a lack of light hitting the leaf.