Plants directly under lights paling entirely

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jimmykimmel

Active Member
Hey guys, just a little problem.

In my room I have 4x600w hps, each light has 4 plants under. Down the middle of the lights there's another 8 plants just because there was plenty of room.

My problem is that the 16 directly under the lights are paling, the complete plant is going quite a few shades lighter than the 8 in the middle that aren't directly under a light. ( the ones between the lights are a very nice dark green)

What could this be? What causes the entire plant to pale at the same time. There's no issues with the plants apar from that they're all growing really nice buds and coming along quickly just don't understand.

Pictures to come when the lights go off

For anyone who cares these are some lovely stinky blue cheese and are just under 5 weeks into flower :)
 

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J

jimmykimmel

Active Member
I've attached a picture just for illustration purposes as I know it's hard to see with lights on, but even so you can see the differences.

Without the light on it's much more noticeable

First I thought it was underwaterint as the ones under lights would dry up faster, but usually that's more of a yellow from the bottom up right?
 

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idfuckmyplants

idfuckmyplants

Well-Known Member
jimmykimmel said:
I've attached a picture just for illustration purposes as I know it's hard to see with lights on, but even so you can see the differences.

Without the light on it's much more noticeable

First I thought it was underwaterint as the ones under lights would dry up faster, but usually that's more of a yellow from the bottom up right?
Click to expand...
What sort of distance you got from the plants to light ?
Could be light burn?
Low on nutrients ?

Don't know a great deal but possibly a couple areas to look into on here .
 
J

jimmykimmel

Active Member
idfuckmyplants said:
What sort of distance you got from the plants to light ?
Could be light burn?
Low on nutrients ?

Don't know a great deal but possibly a couple areas to look into on here .
Click to expand...
About elbow to finger tips away, none of the usual signs of being too close to the light but it's abit weird how they are yellowing.

About 2 weeks ago I put loads of sticks in and while I was doing it I moved them all around. Mixed all the pale ones in with the others but now two weeks later it's done it again the central ones are a lot greener.

I'll try and up the nutrients abit see if it helps them.

Appreciate the reply
 
rob333

rob333

Well-Known Member
jimmykimmel said:
I've attached a picture just for illustration purposes as I know it's hard to see with lights on, but even so you can see the differences.

Without the light on it's much more noticeable

First I thought it was underwaterint as the ones under lights would dry up faster, but usually that's more of a yellow from the bottom up right?
Click to expand...
couple of things one it aint the light as i have mine about 6 cm in away from the light with a cool tube it looks like u are haveing heat issues or could be a ph issues or even a deff whats ya ph also you got a ppm what is the ppm standing at now ?
 
rob333

rob333

Well-Known Member
jimmykimmel said:
About elbow to finger tips away, none of the usual signs of being too close to the light but it's abit weird how they are yellowing.

About 2 weeks ago I put loads of sticks in and while I was doing it I moved them all around. Mixed all the pale ones in with the others but now two weeks later it's done it again the central ones are a lot greener.

I'll try and up the nutrients abit see if it helps them.

Appreciate the reply
Click to expand...
dont up the nutes just yet what nutes are you useing ? and at what ml rate ? better still get me your ppm and what week of flower yoy in ?
 
rob333

rob333

Well-Known Member
jimmykimmel said:
About elbow to finger tips away, none of the usual signs of being too close to the light but it's abit weird how they are yellowing.

About 2 weeks ago I put loads of sticks in and while I was doing it I moved them all around. Mixed all the pale ones in with the others but now two weeks later it's done it again the central ones are a lot greener.

I'll try and up the nutrients abit see if it helps them.

Appreciate the reply
Click to expand...
it could also be that u are week 5 and they are starting to pull the nutes from the leaves just this time around they are taking more at a faster rate which gives u the pale leaves
 
idfuckmyplants

idfuckmyplants

Well-Known Member
jimmykimmel said:
About elbow to finger tips away, none of the usual signs of being too close to the light but it's abit weird how they are yellowing.

About 2 weeks ago I put loads of sticks in and while I was doing it I moved them all around. Mixed all the pale ones in with the others but now two weeks later it's done it again the central ones are a lot greener.

I'll try and up the nutrients abit see if it helps them.

Appreciate the reply
Click to expand...

If your forearms are short the light could be to close ? .. lol
 
J

jimmykimmel

Active Member
rob333 said:
couple of things one it aint the light as i have mine about 6 cm in away from the light with a cool tube it looks like u are haveing heat issues or could be a ph issues or even a deff whats ya ph also you got a ppm what is the ppm standing at now ?
Click to expand...
I assumed if it was something to do with nutrients or a deficiency it'd be wide spread and not solely on the plants under a light? Or do the ones under a light require higher nutes?

I use a pretty powerful filtration system with fan controller rooms at a solid 25c at the canopy shouldn't be heat issues? Unless the lights adding quite a lot of heat on the leaves I guess.

On my stick it's on 1.9 on the truncheon not too sure what that relates to in ppm as it's not closeby
 
idfuckmyplants

idfuckmyplants

Well-Known Member
Is that the only fan in the room ? As it would appear the ones directly under the light are furthest away , maybe better airflow ?

Just ideas.
 
J

jimmykimmel

Active Member
But alas as I say if I move the pale ones into the middle in a couple weeks the green ones will be pale so I'm sure it has something to do with the light. Could it be that they're drinking a lot more under the light so need more nutes?

Other than that all I can think of is light burn or bleaching
 
J

jimmykimmel

Active Member
idfuckmyplants said:
Is that the only fan in the room ? As it would appear the ones directly under the light are furthest away , maybe better airflow ?

Just ideas.
Click to expand...
They're two of those, all then canopy has a breeze at some point as the fans oscillate

Can you add videos on here does anyone know?
 
idfuckmyplants

idfuckmyplants

Well-Known Member
I
jimmykimmel said:
Haha I'm 6ft 5 so it's a pretty big arm. Could try and raise them if you think it'll help but the leaves really aren't showing any curling up or anything like that
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I wouldn't do anything solely on my suggestion lol

Just possible areas worth looking into , either way I'm sure you'll end up with plenty of bud :)
 
idfuckmyplants

idfuckmyplants

Well-Known Member
jimmykimmel said:
But alas as I say if I move the pale ones into the middle in a couple weeks the green ones will be pale so I'm sure it has something to do with the light. Could it be that they're drinking a lot more under the light so need more nutes?

Other than that all I can think of is light burn or bleaching
Click to expand...
The only logical reason I could think of for the ones under the light possibly using up more nutes would be them getting more light/energy so getting more tools to build then the others ? :s

Could be wrong .
Could be a genius.
 
J

jimmykimmel

Active Member
Hehe, I guess I'll leave it for now see how they get on I don't think it's too bad

I use

Canna coco medium
Coco a+ b
Rhizotonic
Canna zym
Canna boost accelerator
Molasses
Great white
Myko fungus

I vary my ph from 5.8-6.2
I flush them with the additives but without fert every 4th feed
Will be adding pk13/14 next week on the 6th week on flower
 
Tupapa

Tupapa

Well-Known Member
I will rotate the plants in a regular basis also it can be a sulfur def u might wanna add some epson salts a couple of times in ur water/feeding schedule just to c if it does the trick., The plants look good to me., Also like someone sed at this point in flower they start using a lot more nutrients how much and how often you feeding them? U might wanna add a little more nuts in your schedule too and check if it works. Overall they look pretty healthy to me. Your doing a good job., Might wanna add some fulvic and humic acid too and c if it helps maybe a little kelp, silica also in small doses and c if it works. GL bruh
 
J

jimmykimmel

Active Member
Tupapa said:
I will rotate the plants in a regular basis also it can be a sulfur def u might wanna add some epson salts a couple of times in ur water/feeding schedule just to c if it does the trick., The plants look good to me., Also like someone sed at this point in flower they start using a lot more nutrients how much and how often you feeding them? U might wanna add a little more nuts in your schedule too and check if it works. Overall they look pretty healthy to me. Your doing a good job., Might wanna add some fulvic and humic acid too and c if it helps maybe a little kelp, silica also in small doses and c if it works. GL bruh
Click to expand...
Thanks for your reply dude. Appreciate the good comments.

I feed them daily, not all of them just whoever needs it but they drink about 2 litres every two days maybe tiny bit more some of them

I'm pretty much following cannas guide to the letter plus adding a few other bits as I said currently on period 1 on the photo will be adding pk13-14 next week. I started with help from someone about 5 years ago and I've had many successful crops but didn't really experiment as I was learning. Butnow I am adding other things to try and do better with quality and yield(used to just use a+b)

I thought cannas guide would be a good place to start and then add to it
 

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J

jimmykimmel

Active Member
I plucked a couple leaves off and put it in some better light as you can see the pale ones are much lighter. I've found some evidence of maybe some heat stress see pictures the edge of the leaf is very slightly curled up and abit prickly could this be why?

Also only a few leaves are like this the lower ones are all fine but still pale
 

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Doomhammer69

Doomhammer69

Well-Known Member
Have you thought of looking at the plants while there not under the light? HPS while under the light makes the plants look yellowish, while pulling them away they turn green again, I guess what I am saying if its what I think it is its just the HPS yellow refection on the leaves, opps I spoke to soon, I didn't see the next posts, Good luck.
 
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