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Yellow spots on biggest plant’s leaf

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Yellow spots on biggest plant’s leaf

BlueberryNewbie 4 Replies 1,351 Views
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BlueberryNewbie

BlueberryNewbie

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Hello
I bought a lighter lamp and almost immediately these spots came out on the biggest leaf I left on the main stem, I don't know what they could be, light stress, nutrient excess, or lack of nutrients (I was thinking about calcium being the first time I use ro water and calmag)... what’s your opinion?
 

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Give it some cal/mag.

When I switched to LEDs, my lower leaves would burn like that. It seems to me to be related to a need for more magnesium, but it could be calcium.
 
I put cal mag but being the first time for me using it I checked the sheet indications and add 1 ml for 2 liters, I’m gonna use 2 ml.
Thanks!
 
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