I have experimented using red and white salt blocks right beside each other. White is the best hands down, and use white feed salt and water it into the ground if you can (they will eat the dirt and last longer then a block. You are starting a little late for my liking, but the last thing you do before the snow flies is dump salt, first thing you do when you can get into your spot is dump salt. Don't start multiple spots in one area (get them coming to one spot) you cant control what the next guy does, but you can control what you do. You will have 10 X the animals coming in the second year, but this late in the game, 2013 might be the ticket. Regardless, next year will still be a bunch better then this year. Hope this helps.