Anyone know what deficiency this would be?

wondering if anyone knows what my plants deficient in, going on with only a couple, rest of mine are loiking healthy.. heres pics to provide what the bottom foilage looks like. basically few bottom leafs yellowish, with green veins, plants been living in a pure organic living soil i made

it really looks like light burn but since it is a bottom leaf i doubt it. i would say mag..

here is a handy website http://www.growweedeasy.com/cannabis-symptoms-pictures

alright thanks there, ill have to maybe feed it a little organic cal mag i got here from natures nectar see if that stops more from turning like that.

Looks like mag. Add a lil Epsom Salt to your feeding schedule and it should perk up! I use MegaCrop nutrients and dont have to add a single thing. It's one powder used from seed to harvest. Great stuff and they have a free sample going on right now fwiw