Light burn, nutrient burn or deficiency?

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steve1989

Member

• Feb 19, 2021

• #1

Hi Guys

I am getting lots of brown edges on main fan leaves.

It is my fist run with LED, at first it was just one corner of the tent that seemed effected, and in that corner the lighting is closer to the canopy. Since then others across the room seem to be effected.

I am running the following nutrient

A&B at standard dose
Rhizo at standard dose
Boost at standard dose
PK at standard dose
Mag Cal standard dose

I have recently upped the temps to 28 Celsius and 65-70% humidity.

Wondered if it could be something other than light burn?

Any pointers would really help me out.

Thanks
Steve

 

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steve1989

Member

• Feb 19, 2021

• #2

Sorry, with images!!

 

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Growbig420420

Active Member

• Feb 19, 2021

• #3

I'm no expert but all of those nutrients seem a bit overkill, especially at a standard dose for each one. Maybe lower the nutrient mix to like half dose for all of them and see if you get any improvement. It does look like nute burn/toxicity

 

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Growbig420420

Active Member

• Feb 19, 2021

• #4

Also what light is it, what wattage is it, how close to the canopy etc.

 

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Growbig420420

Active Member

• Feb 19, 2021

• #5

Usually with light burn it's the leaves closest to the light source, but from what I can see a lot of lower leaves have it too

 

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steve1989

Member

• Feb 19, 2021

• #6

Growbig420420 said:

Also what light is it, what wattage is it, how close to the canopy etc.

Click to expand...

They are 640 watt led, 4 of them in total covering a 2.9m x 2.9m space.

They sit around 24-26 inches above the canopy.

To be honest it is mainly the top leaves that are worse effected?

Thanks
Steve

 

70's natureboy

Well-Known Member

• Feb 19, 2021

• #7

You are getting the standard dose of nute burn.

 

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steve1989

Member

• Feb 19, 2021

• #8

70's natureboy said:

You are getting the standard dose of nute burn.

Click to expand...

What would you recommend? When growing under hps bulbs I never had this problem?

 

70's natureboy

Well-Known Member

• Feb 20, 2021

• #9

I don't see how lights made that much difference. I am experimenting with some LEDs and my plants got the nice rusty spots under the LED lights. I understand that is a cal or mag deficiency. I plant to ask the forum about this soon. I am feeding the same as always so far. Yours look just overfed like I used to do all the time 25 years ago.

 

Hollatchaboy

Well-Known Member

• Feb 20, 2021

• #10

It looks over fed to me. Dark green leaves, possible clawing, maybe N toxicity?