Yellow edges, what nutrients do I need to supply

Hey everyone, brand new to rollitup. For the last couple years I've used this site for various help on my babies.
This year I used some crappy bag seeds I got out of some alright bud. I made the grave mistake of not using my own organic made soil but instead just threw them in the ground.
I have not used any nutrients of any kind so far and I'm about 2-3 weeks into flower now. The girls are outdoors in various locations.
The tips are yellowing and the veins are green still. They aren't rapidly turning yellow, in fact it may have stopped but I'm just wondering what or if I should do anything?
P.s I know they are small and in very terrible shape. Don't judge me too much I'm somewhat new to this and I love the whole process but next year I'm definitely going to be using super soil.
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