Possible heat burn or something else?

[Pountre]

Hello growers, I would need your help identifying what the problem with this plant might be! It has grown very fast in the last 3-4 days surpassing where my air filter is and is pretty close to my HPS lamp, which is why I think this might be a heat burn, however I am a beginner grower and need advice, thank you for any information!

 

[SweetLeafGrow]

Welcome to Bud Builders!

I use LED's so I am not familiar with HPS and what they can cause if too close to the plants, I am sure someone here will be able to help.

A couple things you might want to do is give more info about your grow, as much as you can, and also, get some photos under regular white light, I do think it's going to be a bit hard to diagnose leaf issues without more information and better photos.

 

[GoodShit97]

I agree with SweetLeaf above, we need more info and pictures under natural light

 

[Pountre]

I will make some pictures when I get home. The plant is an AF from Barney seeds, the plant is about 50 days old. I am using bionova soil supermix as fertilizer. I use a 660W HPS bulb for 22h a day.

Welcome to Bud Builders!

I use LED's so I am not familiar with HPS and what they can cause if too close to the plants, I am sure someone here will be able to help.

A couple things you might want to do is give more info about your grow, as much as you can, and also, get some photos under regular white light, I do think it's going to be a bit hard to diagnose leaf issues without more information and better photos.

 

[GoodShit97]

It could be light stress from 660 watts at 22 hours.
I'll wait for clearer pics, but I would say drop back to 18 hours on, maybe even 16.
What size is the tent?

 

[CannaGranny]

Welcome to budbuilder’s @Pountre !
Looks like light burn to me. The give away on that, is leaves underneath are protected and show no burn.
HPS is a pretty hot bulb, more so with your plants growing so close to it.

 

[Max]

agree,you can see the leaves have burnt tips

 

[Max]

maybe reduce the strength what your feeding them.. https://bionovanutrients.com/Bionova-Soil-Supermix/500525Z

 

[CookiesLikeWhoa]

22 hours of lights on is going to be tough on a plant. Would try dropping it to 16~ hours to get your DLI down. You can run it that hard, but I don't know what the plant would need to take that.

Too me it looks like a possible calcium deficiency brought on by being slammed by too much light.

 

[Pountre]

Welcome to budbuilder’s @Pountre !
Looks like light burn to me. The give away on that, is leaves underneath are protected and show no burn.
HPS is a pretty hot bulb, more so with your plants growing so close to it.

Yes! Thank you, I was questioning if it was heat burn because the light is really close to the plant since it grew so much (about 10-15cm from the bulb)

 

[Pountre]

It could be light stress from 660 watts at 22 hours.
I'll wait for clearer pics, but I would say drop back to 18 hours on, maybe even 16.
What size is the tent?

Thank you for the information! The tent is 0.6x0.6x1.5 meters.

 

[GoodShit97]

Thank you for the information! The tent is 0.6x0.6x1.5 meters.

Oh yeah, drop down to 15 or 16 hours with that light in a tent like that.
Might even want to bend the tops over to get more space between the light

 

[Pountre]

Welcome to Bud Builders!

I use LED's so I am not familiar with HPS and what they can cause if too close to the plants, I am sure someone here will be able to help.

A couple things you might want to do is give more info about your grow, as much as you can, and also, get some photos under regular white light, I do think it's going to be a bit hard to diagnose leaf issues without more information and better photos.

Hi, I attatched some photos. I have some new problems though, when I got home today some of my plants started looking REALLY sad. The leaves are basically hanging and about 3-4 more leaves have the same looks as the first pics. Someone suggested lowering light time (from 22/7 to 16/7), I am also considering turning the HPS down from 660W to 400W, would that be a good idea or should I not change the watts?

 

[Pountre]

Oh yeah, drop down to 15 or 16 hours with that light in a tent like that.
Might even want to bend the tops over to get more space between the light

Thank you for such a quick response! Should I also drop the watts from 660w to 400w?

 

[moe.red]

Thank you for such a quick response! Should I also drop the watts from 660w to 400w?

I would. Give them time to recover. Lowering the lighting slows things down and gives you time to make adjustments and react

 

[steamroller]

That looks like Calcium deficiency to me.
I would lower the light power and the hours along with supplementing Ca.

 

[Pipecarver]

Hey, welcome. I grew under 1000w hps for years and my rule of thumb was if it burns my hand it'll burn the leaves. So far enough away so your hand is warm, even hot but if you can't leave your hand where the plants are its too close. I like 18/6 my plants just seem healthier than with longer on hours,

 

[Rootsruler]

Looks like light burn to me too.

 

[Pountre]

maybe reduce the strength what your feeding them.. https://bionovanutrients.com/Bionova-Soil-Supermix/500525Z

I am using that fertilizer already, 25ml/10l

 

[Pountre]

I would. Give them time to recover. Lowering the lighting slows things down and gives you time to make adjustments and react

Thank you, will do!

 

[Pountre]

That looks like Calcium deficiency to me.
I would lower the light power and the hours along with supplementing Ca.

Thank you for the information, is bionova Calcium fertilizer good?

 

[steamroller]

I have not used that brand but will blindly say that calcium should be calcium.

 

[CookiesLikeWhoa]

Thank you for the information, is bionova Calcium fertilizer good?

The thing to check is if it's calcium nitrate based. If it is, you have to worry about upping N in the middle of flower. If it's calcium sulfate you have less to worry about.

 

[steamroller]

The thing to check is if it's calcium nitrate based. If it is, you have to worry about upping N in the middle of flower. If it's calcium sulfate you have less to worry about.

I should have known that since I use Jacks for calcium.
15-0-0.