I'm growing about 10 Northern Lights plants and in all of them the bottom leaves are turning yellow. They are nearly a month old, under a ufo led light set to 18/6. The soil used is black gold. I have been really busy and have not used nutes yet, and I'm thinking maybe it's a nitrogen problem. Any help here would be great, please be critical. Pic: http://imgur.com/XDvQL.jpg Also: does anyone have suggestions for brands or ratios I should try for nutes during veg and flower? Thanks.
Definately need some (N) about now. I would adjust the ph 6.5-6.8 first and feed 1/4-1/2 strengtn veg nutes....