Light burn, nutrient burn or deficiency?

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steve1989

Member
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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Growbig420420

Active Member
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
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
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

70's natureboy

Well-Known Member
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.
 
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