Diagnonsis required: Autoflower Brown dots/patches

Hello everyone,

This is my 4th grow did CFL only before now doing Mars II + CFL

My setup:

1x 400W Mars II light
2x 125W large CFL 6300K
3x 105W large CFL 2700K
2x small fans
Tent stays open for circulation
AC will be on in the summer to regulate temp.


My plants:

2x AutoXtreme from Dutch Passion about 19 days old

Autoflower Seeds

Problem:

I have pictures of the leaves could someone tell me if this is nut burn? I flused with 10L each plant just in case.

Would appreciate some times & help

Thanks,

Looks like multiple deficiencies, aka a PH problem.

nomofatum said:

Looks like multiple deficiencies, aka a PH problem.

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pH runoff water: 7.2

Any suggestions?

Cyklos said:

pH runoff water: 7.2

Any suggestions?

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Water with PH 6.0 or less water/nutes until that reads 6.5 or a hair less, then start watering with PH 6.5 water/nutes going forward.

nomofatum said:

Water with PH 6.0 or less water/nutes until that reads 6.5 or a hair less, then start watering with PH 6.5 water/nutes going forward.

Click to expand...

Hi nomofatum

Did exactly what you said pH dropped to 6.8 now, however, problem persists and upper leaves also have signs now.

I found out that when using Biobizz you should not use chemical PH balancer could it be that this is why it is caused?
I will try to balance PH with vinegar from now on...

Here some pics update

Thanks for the help