yes, there is

perlite is meant to increase aeration in the soil, or how much air will get to the roots .. so just putting it on top of the soil won't do any good
mightymarijuanabuds Reviewed by mightymarijuanabuds on . Perlite question.. Well my bag came with soil/perlite ..but not enough..is their a difference in mixing it in with the soil or just putting it on the top of the soil? Rating: 5