Yellow leaf

Hi all, New to the group... I've spent the past couple of nights searching old posts but I'm more confused now than ever. Please help

Second crop on the go... 7 plants K2. Week 3 of flowering 12/12 All well until a couple of days ago. Yellow leaf began to creep in, older larger leafs first now wide speed. Leaves also appear light in colour and droopy more towards the bottom of the plant.

I'm using flood & drain running 24/7 nute Vitalink bloom 4ml A + B per ltr mix. PH always seems low, I adjust with ph up. EC meter shows 4.3 (Whatâ??s that mean?) Anyway I used a Vita link buddy boost in my last 50ltr mix but decided to ditch the whole batch as soon as yellow leaf appeared.

My first thought was nute lock out... But now I'm thinking I might be under feeding them as I'm using the same strength mix as I did in week 1.

Top 3 pics taken today, bottom 2 taken 3 days ago...

Cheers Oakiedoke Heavily taxed, somewhere in UK

I find my plants go N def. in the first few weeks of flowering as they quickly grow vegetativly in those weeks. that may be your problem. or Mg

this website is very useful

International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!