Mephisto Genetics 3 Bears OG Top Feed Recirculating Hydro Journal

[Mañ'O'Green]

Looks like a potassium deficiency more than light burn, Too much Ca?

Still a nice harvest!

 

[Animatey]

Looks like a potassium deficiency more than light burn, Too much Ca?

View attachment 1158249

Still a nice harvest!

Thinking it was too much light since it stopped when I dimmed the light. It was also worse where the light was more intense.

She was 10 inches away from the light with no more room to raise it.

No Ca additive, using DynaGro nutes only during flower including ProTekt which has only potassium in it (and silica). Also using their Mag Pro but only at 2ml/gal max.

Not 100% certain, but pretty sure the cobs were what yellowed her upper leaves. In an article i was reading, potassium def can look like light stress and Visa versa, it's a tricky one...

Keeping your grow lights too close, for example with powerful LEDs and HPS grow lights can give your plants “sunburn” even if the temperature is cool! This can sometimes look like exactly like a cannabis potassium deficiency when the true problem is your grow lights are too close to your leaves.

Borrowed from growweedeasy

 

[slowandeasy]

Thinking it was too much light since it stopped when I dimmed the light. It was also worse where the light was more intense.

She was 10 inches away from the light with no more room to raise it.

No Ca additive, using DynaGro nutes only during flower including ProTekt which has only potassium in it (and silica). Also using their Mag Pro but only at 2ml/gal max.

Not 100% certain, but pretty sure the cobs were what yellowed her upper leaves. In an article i was reading, potassium def can look like light stress and Visa versa, it's a tricky one...



Borrowed from growweedeasy

10 inches is too close for cobs. It can cause deficiency type symptoms, but yours actually looks like s deficiency. Either way its too late and you should keep eye on next run. Peace, slow

 

[Animatey]

10 inches is too close for cobs. It can cause deficiency type symptoms, but yours actually looks like s deficiency. Either way its too late and you should keep eye on next run. Peace, slow

10 inches was OK once I dimmed to about 50 watts.

Since I can dim the light I don't pay too much attention to distance, but I pay close attention to Lux at canopy, and if it's spread evenly.

I recorded the lux many times a week trying to get a baseline for autoflowers since they are much more sensitive to light than photo periods.

The image doesn't show everything I record, but I started to burn her around December 25th when average lux at canopy was over 25k. That's the value Tlux in the sheet.

You can see I went back down all the way to 18k by Jan 1st after she was burned and that was about where she could tolerate it.

I also record pH and EC, whether I added pH down or topped up with water etc. So I have a baseline EC for autos in the future as they seem to eat a lot less also...

Here is the form I fill out every time I visit my plant:

Currently my photo period flood and drain plant is happy at 2.2 EC at 30k lux average... Pretty different... I was also able to keep her nice and small since I had control over veg time

I'll probably stay away from autos until I get everything dialed in with photos as they are easier in my space using hydro.

One thing I found is that the serrated edges folding are the first sign of too much light. Once those start to go up, it's time to dim back to the previous lux value. You can see some of that starting on my photo plant when I tried to take her to 36k average lux.

When I went back through my photos of this auto plant, I could see the serrated edges start raising at various periods when I was increasing the light intensity beyond what she wanted.