Iron?

Guys check the diary if u can .. she have almost 4 months, 2,5/3 months in that pot only with 1 ml/ l alg a mic and she was healty before .. all green , stems and leafs .. i water every ph at 6/6.2 i mesure every time before feeding.. not flushing to mesure the run off unless i have no other choice .. i started the 12/12 period tonight hope she recovers

Hey man I have this problem everysingle grow and its very hard to get rid off. If you havn't got your nutes locked in. Then its pretty much guaranteed to happen though I have never noticed and huge differences in yield red stems or not. I understand it is a deficiency of phos but most are reluctant to give much phos in veg because they simply don't need that much at that stage. The yellowing can be a huge varity of things most probaby a nitrogen deficiency try raise the EC abit and see how you get on. I have the same problems as you can see by my plants. Also alot of growers on here will disagree with what im about to say but that is a bit over the top on the defoliate. You are going to slow your girl down and limit her yield when moving into flower with next to no foliage is a bad plan. I know alot of american growers seem to swear by but from what I have found I get much more from a plant just by removing lower branches that dont cut above the canopy as they will get no light wasted energy. Either way your plants are looking great you certainly know what your doing :) Everyone grows differently and there is no Right way to do it. 👊

Yes looks like an iron defiency to me . I had this problem a while ago . So I started addimg calmag solution that contained iron . I always add calmag plus as I have soft water in my area . So I up it to 0.4 EC and add base nutes on top of that . I only use soilless though so not sure what to do with soil. But yeah that looks like an iron defiency .

Normally in veg, when your stems and stems of leaves start turning red, purplish and that isnt in their Gene's, their telling you they need a little more food. You should always clean up removed leaves from the planter as that promote infestations. Cheers