SOIL Burn or Manganese deficiency?

[Thysanoptera]

I'm helping growing an AK-47 regularis outdoor in Portugal.
She's been in soil since the last day of March.
She started to flower a long time ago but with the days getting longer in the past couple of months she's flowering very slowly.
It's in a 50l vase, with Gold Label special mix soil and she's been receiving Gold Label nutrients. She drinks, daily, around 4l of water, and receives about 1,25ml/l of Soil A and Soil B, 0,5ml/l of Mg, 0,25ml/l of Pk and every two weeks around 0.2ml of Enzyme.

She seems underfed, I'm thinking it's due to the fact that it has already 5 months, rather an old plant, but should I increase the dosage of nutrients?

I've also found some spotted leafs, which are on the pictures, and I'm not sure if its some kind of burn or if it's a Manganese deficiency or any other nutritional deficiency?
Thank you guys

 

[Rwise]

What we have here is a Root/PH issue.

 

[Thysanoptera]

How do I resolve it?
Should I transplant it to an even bigger vase?
I dont have any way to measure the pH of the soil unfortunattely

 

[SoOrbudgal]

Hello i have outdoor plants that are old and older than yours going through same issue photoperiod and 2 big autoflower. I looked up on this site in the section of " plant problems mag. deficiency shows leaf photos" i also looked at other pics on the web. I believe i've got it also my plants well the photo period like yours have been in their soil for many months but my pots are bigger. Mine i gave each Epsom salts made for plants not perfume crap. It's a watering flush 1tablespoon per gal.

 

[Thysanoptera]

Did the Epsom salts solve it?
Do you think it's a Manganese deficiency?

 

[Rwise]

Is the food PH'd? Is the water PH'd? If its not the feed/water, then what is the PH of the soil? Does it have PH buffers? I use pelleted sulfur and dolomite to buffer the soil PH.
A much larger pot may help.

 

[SoOrbudgal]

It has improved overnight they look way better today Thysanoptera