What is my leaves yellow?

Thank you for your answers guys, but my pH of watering and run off is around 6.5 My ppm runoff did not show excess of nutes. The white dots on leaves is bcz of the spray of homemade fungicide(veg. Oil, bicarbonate and organic soap) i do not foliar feed.

To add to some of the great comments below - noticing a lot of white "Salt/Water" spots on the leaves...have you been spraying them with something that could be over fertilising the leaves directly or burning them? May be over-doing your foliar feeding too. Hope this helps in some way and GL with the grow! :)

I would say you have some lockout going on with the dark green leaves. I would flush and also check under the leaves for bugs and spray with dawn soap and water if you happen to see any. Adding cal/mg should be every week or 2 in soil if you need to. Check your runoff ph and ec levels, that will tell you if your ph is out or your ec is way high. Cheers

Just try upping the nitrogen levels or overall nutrient levels. Make sure you watering with plain Ph'd water every now and then to move excess nutes around👍🌱