bottom leaves are very yellow!why?

i veged for a month now they have been flowering for two days ive given it black strap molasses twice every other watering. so why are they yellow??

Probably lack of light, Bottom leaves die off.
It just happens

yeah dude, that looks like a pretty healthy plant to me. so kudos dude. the plant is basically killing those leaves because they are taking more energy from the plant than they are giving back. just cut them off. but dude, you should have your plant bare 1/3 of the way up the stalk when you go to bud. so its no big deal at all. next grow, or even this one you could hang some cfl's about mid plant, and when it gets taller you can even put them under the plant. just make sure you got a fan going, but remember the more light the better!! good luck dude