Underfeeding?

Hi guys im starting to have some problems with my grow.
5th week into flower
they are in 6in rockwool in netpots.
PH 5.8
Im using maxibloom powder about 1800ppm
I am watering 3 times daily for 15 mins
Looks like plants directly under the lights effected the worst.

Am I under watering or under fertilizing?

Nute burn, you should be fine just bump em down a bit and mayb do a flush.

thebay420 said:

Nute burn, you should be fine just bump em down a bit and mayb do a flush.

Click to expand...

Are you sure? I really don't think its nute burn.
I've been slowly increasing the ppm of the reservoir.
Ive started flowering at about 900ppm went up to about 1200 over about 2 weeks but i was only watering once a day for 15 mins.
They were growing pretty slowly and showing signs of deficiency so i figured i was under watering or under feeding.
I flushed the system with a GH cleaning stuff.. forgot what its called. Anyway i ran the system clean with only water thinking i had a toxic salt buildup and that was causing a lockout or somthing... plants responded like a plant should without any nutes.. got pretty yellow.
I readded the nuets to 1200ppm and they recovered somewhat. But throughout the 3rd week they continued to show signs of deficiency.
4th week i started uping the nuets by about 100 per day.
Im up to 1800 now on the 5th week and they still look like this.

Forgot to add I've been foliar feeding once a day right when the lights come on.
Ill prob stop now since the buds are getting bigger.

temps are about high 80s up to about 90. The plants seem to be taking the heat ok.... unless that could be my problem....
Once in awhile they will get a dose of CO2 from my hotwater tank when someone takes a shower.
At night the temps stay steady at 75f
Humidity is normally about 40% 50%

Again it looks like the plants directly under the lights are affected the worst.
There are a few plants that don't look to have any problems at all and they are not directly under the lights.
Plants with more light require more neuts?

Any help is appreciated while I try any brainstorm this one out myself.

still open to advice

Honestly to me it looks like heat stress... how far away are your lights?

doesn't the second picture look like a zink def? I'm not a pro grower at all, but i can match a picture! and that is what it looks like in the second picture.. if not please ignore! good luck bro, they look good none the less

yeah im not liking rockwool either.

Shit I think i might have forgot to add I am watering 3 times, for 15 mins while the lights are on "12h"
Should i increase my waterings or increase the ppm?

Do you use cal mag?

I was using epsons salt in the folier spray I was using. I really don't think it did much lol..

I'm not currently in the res. Only maxibloom powder.
Currently 1600ppm
4 times a day 15mins

You are better off throwing a dart at a "plant problems" poster than asking for advice here.


What is your water source? If it is RO or "soft" tap water, you might need to supplement with cal-mag to get the water to around 150-200ppm before you add the Maxibloom.

my water is from the tap it comes out at:
7.1ph
50ppm

That is "soft" and should be supplemented with cal-mag before you mix you nutrients. I add 2.5mL/gal of botinicare's "cal-mag plus" before anything. I have tap water similar to yours.

great! Ill add this now.
I really appreciate your help!

That's a def nute burn loose the powered bloom get floranova bloom use 4ml rest of cycle u will love it btw bat guano hgh in P is the shit!