leaves going brown

m new leaves are growing brown,have been placing my plant outside for sun light ,i just fertilized it hopefully that might help,any suggestions?
i think ive made a complete balls of this so all help s needed

alright what you gotta do is cut your ferts...
this IS almost definetly whats making your leaves go brown.
how big/old is your plant?
how long you been givin it ferts?.....

That could be what's doing it but how can you say that it is definately doing it with out even knowing the setup Greenstick???? You don't even know what he is using for fertilizer. Conerned, post the full details of your setup so we can help you diagnose and fix that problem of yours. Soil, fertilizers used, pot size, watering cycle, grow enviroment, temps, lighting, etc. List as much info as you have and it will make it easier for people to figure out the problem. :)

i am using normal plant compost and i only water when i thought the compost was dry,was using sunlight as my light but he last couple of days have been showery ,i used mg as fert once ,but know have my seedling under a 58w ff lamp so what do i do plant growing very slowly

What size is your plant and what size pot is it in? Does the soil have any vermiculite or perilite added for aeration? The Miracle Grow could definately have done it. It can easily burn the plants if you use a bit too much. How long ago did you use it? If recently, then you want to flush it with plain water. Water it until the have the pot size has flowed out of the bottom of the pot. Just stick with plain water until the growth starts looking healtier and then you can fertilize it again, but I strongly recomend organic fertilizers. Nothing can replace what mother nature created.