nutreints keep burning my leaves why?

Were do I get most of the stuff ? Does home depot or lowes an walmart have something.. I have a newly opened grow store where I live called 422 grow they carry a lot of nutrients an shit icould probably get ever thing i need there right?

How old are your plants? And some pics would be nice...

If you want to use your AN nutes go mg soil for seedlings or something similar. I quit dirt and went hydro because of all the probloms.