yellowing in week 2 flower.

caveman117

caveman117

Well-Known Member
Hi guys ive got four plants in aa closet wwith 2x 400 w hps. The two plants on the left side of the closet have started to yellow pretty heavily and its only week 2.

At first I thought it was because of a drought they had, not long but they got really dry on a lights on period where somehow my exhaust fan got unplugged.

Now I dont really know what to think. It kind of looks like n def. ButBt I know the medium has plenty of available organic n. Also the two plants on the other side are doing great.. with the same watering/feeding schedule.

I should pist a couple pics of what I mean and I will in a few when my lights come on.
 
caveman117

caveman117

Well-Known Member
Also just for clarification the two pics I took out of the closet (with the t5 in thw background) are the plants in question.


Edit* also my temps are high. 85 ish on avg give or take a few. Ive thought it could be heat but shouldnt the othet two benshowing signs too? Especially since the one in the smallest pot/ most rootbound theoretically should be showing the most signs of heat stress no?
 
caveman117

caveman117

Well-Known Member
Hmm ok what would you guys recommend doing? Add like a quarter dose of veg nutes along with my normal flowering nutes next feeding? Nervous about adding n during flower.
 
Hotboxbudz

Hotboxbudz

Well-Known Member
Well almost all your large fan leaves are about to die. I doubt the really light yellow ones will recover. Yeah, add 1/4th veg nutes and you might try a 1/4th veg foliage spray for a week or so.
 
Hotboxbudz

Hotboxbudz

Well-Known Member
If you have good ventilation I wouldn't worry about mold. Just spray them when the lights come on. Nothing to be nervous about, the plant still needs N in the flowering stage, just not as much as in veg.
 
caveman117

caveman117

Well-Known Member
Ok I might try a low strength foliar ifthey dont need water when the lights come on tonight.

Polish out of all those bottles you see there only two have any significant npk. Mostly myco/wettkng agents/root boosters.
All used in proper dosages and rhe only one that gets used consistently is bio bloom/microbe brew

Also could high heat (high 80s) make n def worse or even make the plants look like this on its own? Still doesnt make sense to me if it was heat because the other two are doing fine, I just wanna get the heat tging out of my head for this issue if it shouldnt be part of it.
 
Hotboxbudz

Hotboxbudz

Well-Known Member
caveman117 said:
Ok I might try a low strength foliar ifthey dont need water when the lights come on tonight.

Polish out of all those bottles you see there only two have any significant npk. Mostly myco/wettkng agents/root boosters.
All used in proper dosages and rhe only one that gets used consistently is bio bloom/microbe brew

Also could high heat (high 80s) make n def worse or even make the plants look like this on its own? Still doesnt make sense to me if it was heat because the other two are doing fine, I just wanna get the heat tging out of my head for this issue if it shouldnt be part of it.
Click to expand...
From what I can see in your pics, there is no heat stress. The edges of your leaves would be curling upwards. And only temps in the 90s and up would you see heat stress in a plant that old.
 
caveman117

caveman117

Well-Known Member
Ok makes me feel a bit better haha.
This may sound like a stupid question but I have two thermos in there one is visible in a pic and is hanging and the other is at the plants base (not floor but kinda in pots a bit). The hanging one is also black and I feel like it attracts heat because when I check it its kinda hot to the touch but nothing else around it is.

So should I be reading from base of plants, the hanging black one or somewhere between the two numbers?

Sorry for this being a bit off topic but i feel it could be a change in diagnostics for future reference.

Also thought about putting something over the hanging one to shade it out of direct light?
 
polishpollack

polishpollack

Well-Known Member
I think I need to contradict myself as I've looked more closely at the pic. that kind of yellowing looks more like low nitrogen. next time can you take close up pics in white light?
low sulphur usually develops at the top of the plant. the lower leaves going plain yellow looks like nitrogen def. go easy on the additives. there's no guarantee they are good or work the way you expect. also this kind of plant doesn't seem to respond well to foliar feeding so think twice before you do that.
 
SamsonsRiddle

SamsonsRiddle

Well-Known Member
what kind of npk are you at? with container plants like that you should be doing a 3-1-2 or 3-1-3 feeding schedule. otherwise you will run into that early yellowing. REMEMBER when fixing a n def. it takes time, sometimes several weeks...and if it's starts to "eagle claw" you went to heavy.
 
caveman117

caveman117

Well-Known Member
So last night they needed some water when lights came on so I added quarter strength veg nutes to the solution.

I didnt take more pics but I can tonight. Polish ive always seen my veg plants respond well to foliar feeding and there are some people who swear by it with cannabis.

The npk of the products I use in my feedings are 2-4-4 for the bloom 1-1-1 for bio root and 1-.2-.3 for microbe brew.
 
caveman117

caveman117

Well-Known Member
Also last night was pretty hot inside my house and the hanging thermo read 107!!! The other thermo at the base of the plants was reading 89.

So I took out one of my 400w hps for the summer until I can get my air xooled setup. Because I'm sure we will have even hotter nights this summer.
 
polishpollack

polishpollack

Well-Known Member
usually this plant doesn't tolerate foliar well, but if you feel comfortable doing it that's fine. that temp is awful high.
 
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