Yellow and brown spots on leaves.

I planted 3 seeds a month ago then left for 3.5 weeks. When I got back, 2 of them had grown into fair sized plants with no problems or blemishes at all, despite not having been watered except by rain. Today, I noticed yellow spots on both plants and browning on the leaves of one of them. The seed leaves are also falling off, but that seems like a normal thing. I hope.

I had transplanted them yesterday and might have fucked them up a bit, is this related to that or is it a nutrient problem or something?

Pics related.

the seed leaves falling of is quite normal but by the look of the leaves its magnesium or calcium definciency. have you give them any fertiliser if so its lacking in trace elements.

I've given them no fertilizer. Should I spray the leaves with dissolved lime?

i'd probably start giving them sum kind of nutes, just decide which way to go organic/bio u wnt an npk of a ratio like 6-4-4 or 20-10-10 you get the jist.