not sure if you know but we've got a fab turkey forum right here on byc
https://www.backyardchickens.com/forum/viewforum.php?id=20
loads of fantastic advice and info there and some people who know their turkey stuff
ive heard of spreading the lime but never done it myself. first try and find out if you have blackhead in your area before pannicing
you could always make a raised coop about a foot of the ground so the turkey poults dont touch the ground, IF you have a blackhead problem.
in regards to the...
firstly contact your local enviromental people and ask if you have problemw with blackhead in your area. they should be able to say if it is an at risk area or not.
secondly a heck of a lot of people keep turkeys with chickens without any problem whatsoever.
but....there is always the risk...