Not sure if this is light stress

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Dasnuggster

Dasnuggster

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Is this heat or light stress? The temperature are low 80s' humidity in the 40s. I'm using spider farmer sf4000 at just under 80%. It's a gsc..I grew it last year with a 400 mh/hps and had no problems. This is my first run with an led.
 
Not sure if this is light stress
Not sure if this is light stress 2
Not sure if this is light stress 3
Not sure if this is light stress 4
jguit

jguit

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How close are your lights? LEDs can be VERY intense. What and how much are you feeding?
 
visajoe1

visajoe1

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Plants would be happier if humidity was closer to 64% at those temps. The leaves are under a lot of pressure with that high VPD; leaf temps is too high. Which is why we see the serrated edges turned up on leaf edges, she's trying to cool down

Read about VPD when you have a chance, it will help you.
 
HippiHemuli

HippiHemuli

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Plants would be happier if humidity was closer to 64% at those temps. The leaves are under a lot of pressure with that high VPD; leaf temps is too high. Which is why we see the serrated edges turned up on leaf edges, she's trying to cool down

Read about VPD when you have a chance, it will help you.
Joe is right. https://vpdchart.com/#C,46,25,23,0 Read about VPD and there is chart for you. 🙂
 
Dasnuggster

Dasnuggster

18
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How close are your lights? LEDs can be VERY intense. What and how much are you feeding?
They were about 20 incheses away. I moved them up an extra 6 inches. I'm using Gaia green 444 and giving them a tea every now and then.
 
Dasnuggster

Dasnuggster

18
3
Plants would be happier if humidity was closer to 64% at those temps. The leaves are under a lot of pressure with that high VPD; leaf temps is too high. Which is why we see the serrated edges turned up on leaf edges, she's trying to cool down

Read about VPD when you have a chance, it will help you.
Thanks I'll try to increase the humidity. I raised my lights an extra few inches as well.
 
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