Yellowing lower leaves with brown spots

I am growing white widow in soil. Some of them are growing fine (gaining size) but the lower leaves seem to be going yellow with brown spots. Others are not growing at all and the lower leaves have the same defect. Any ideas?

I thought magnesium deficiency, but they are only seedlings, 2 weeks old.

Thank you in advance

It the fault of your soil and/or what you do/dont add to it
soil type?
amendments?

Yes i wondered that, i used a universal potting soil. Weirdly it worked fine before. Do i need to add something to it? Perhaps it is lacking something...

Pjama said:

Yes i wondered that, i used a universal potting soil. Weirdly it worked fine before. Do i need to add something to it? Perhaps it is lacking something...

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Try adding some nitrogen and potassium.
Worm casting for the former and bat guano for the latter.

That soil looks like crap so I'm pretty sure that's where the problem is.

Agreed nute burn from soil to hot for seedlings

Ok, thank you. Do you think best to re-pot or hope for the best? Perhaps repot the 2 bad ones at least...

Pjama said:

Ok, thank you. Do you think best to re-pot or hope for the best? Perhaps repot the 2 bad ones at least...

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Repotting now will stress them, just water as and when needed and hope for the best tbh.
You need a seedling medium which wont burn them i.e that contains a smaller amount of nutes.

If that was nute burn the new growth would be screwed up. pH is probably shit and there's way to much wood chips in there. They are feeding off the lower leaves to survive.

I'd get a decent soil like ProMix Veg & Herb then scoop those out with a spoon and repot them.