Fast yellowing of leaves, middle of flowering, N defficiency ? Help needed !

Hi everyone, I am new around here and I would appreciate some advice about my first grow.

I am running 4 plants in soil (biobizz allmix) under a 250w hps. Feeding them with plagron nutes (alga grow, alga bloom, green sensation) following recommended dosage.

Everything has been allright until now, 4 or 5 weeks into flower I have rapid yellowing of fan leaves and a few top leaves. the most affected ones turn almost yellow white and fall or detach easily.

I do not adjust my PH at all, i use tap water which has been fine until now. could it simply be N defficiency ? i stopped grow nutes during the stretch period.

any comment would be greatly appreciated, thx in advance !

It looks like it needs feeding , take away those dead yellow leaves they are not helping
once you tidy her up it will be easier to see how quickly she recovers or if more parts start to yellow

from what i can see the leaves that are green look reasonably lush green they are not dry or dehydrated looking which is a good sign
give her some food she should green up quickly if she is healthy and just needs food

peace

You got enough green left you should be ok. Maybe a good, good drench and feed. I would say though that your lighting needs to increase a smidge for 4 flowering plants.

Peace

Thank you guys for your help !

Their next feeding was supposed to be water only ( I add nutes 2 times on 3), so I should flush them and feed them at full strengh ? I may have been over cautious with the dosage...

To Judge Mental:

About the lighting, I actually use a cooltubed 250w with a shitty reflector, but I have a standard reflector unused, would I win significant lighting if I take away the cooltube ?

I have no height issue and the temps are under control... My grow tent is 60*60*140cm.

Yes , if they were my plants I would give them a nice long flush, wash out any built up salts, then feed them half to full strength. You're far enough along now that you don't wanna go crazy with everything. Try and keep them as green as possible til chop. Just a nice balanced feed with everything in it is all you need. I wouldn't mess with your light bro, it is what ya got so...maybe bend, tie, rope your plants in a way to maximize your light footprint. You should get some decent smoke for your first grow, but more important you got some knowledge

Peace

In late flowering the plant start to loose their lower leaves )fan, ect) because the plant is suing all the 'P' for flowering no "N" - NORMAL

That is "normal" in a lot of gardens... not mine

I have the same problem but yours looks a little yellower but when i asked fellow growers about this they said its nothing to worry its just the plant draining all the energy from the fan leafs for bud production and a few said give a little N feed on my next to give them a boost but also ive heard not too feed with high N value nutes during flowering but do a little research as im on my first grow also around the same stage as you , goodluck with the rest of your grow

Thank you guys for the help I appreciate a lot, here is a little update with the most affected one... I gave them a light feed yesterday to see if i could see a difference but I am afraid there is a need to flush as Judge Mental says...
Top leaves are affected too and start looking dry with a taco shape on one of them

Should I do it right now or wait until the soils dries ? it is still moist from yesterday's feeding and I dont want to overwater as I already have high humidity at night after waterings...
Also how long do you think it needs until harvest ?
New seeds are ready to be trhown in veg in another space so it will determine their veg time !

Thx and happy growing to all of you !

Nothing you can do bout those leaves now they're not coming back. I'd watch the green foliage ya got left and go by what that looks like and does. If there is continued yellowing, then probably should flush and put back a balanced feed in your medium. Keep the green you got left for another 4-5 weeks would be rough guess on your flowers.