Texture atlas for terrain?

Hi, is posible texture the terrain object with two atlases in order for minimize draw calls by terrain? One whit diffuse and another contained with the normals for diffuse? I tried already, but it just me i dont know why or really is not possible?

Thanks in advance

 

You would need to have a special terrain shader and a special terrain inspector that can handle atlassed textures.
Its not the easiest of the world but not impossible either to writhe it for your self.