Help

[Jackapozzy]

Hello guys I need help with my grow.
It's a auto ultimate (autoflower), 4 weeks old, in soil, using Top Crop fertilizers, 1000w led full spectrum yellow light.
temperature 25-26° umidity 55%.
I have bo idea what this could be.

[Catfish22]

What size pot, what is your pH, are you adding cal mag?

[PLreef]

Looks like PH issues to me. How are you testing PH?

[Jackapozzy]

Thank for the answer guys.
The soil ph is between 6.5 - 6.9, and I water at ph 6.5 - 6.0, testing soil ph before watering so that I can adjust the water ph accordingly to the soil.
I'm using fairly small pots, 10 liters, I have a small tent, 80cm x 80cm.
I thought about Calmag as well, just got some, will see what difference it makes.

[grouchyoldman]

There are several good possibilities above but I'm betting that Cal/Mag deficiency is your culprit. I had leaves on my last grow the looked just like that and a dose of Cal/Mag stopped it cold. The leaves already affected didn't recover, but there were no new ones.

[Catfish22]

I dont think it is root bound. I had to wake up a bit and realized that 10 l isn't as small as I thought.

I'll still say give that cal-mag and give it 3-4 days.