On private property, you can hunt resident game animals, furbearers and wild hogs over feeding stations with the use of almost any kind of feed, such as corn or soybeans, any type of mineral or salt (block or granular) or with doe-in-heat or other liquid scents, sprays and attractants.
Feeding stations must be maintained with feed (corn, wheat, grain or any other food substance deposited by other than normal agricultural harvesting or planting) throughout the year provided that each feeding station shall have been maintained at least six months prior to the taking of game in proximity thereof. The year-round maintenance and six months of being established rule does not apply when hog hunting.
On public lands (wildlife management areas), you may not use any bait, lure or attractant that can be ingested (eaten or drank) by the animal. That is the difference - if the attractant is meant to be ingested, it is not allowed on public lands. Therefore, use of salt or minerals is prohibited on public lands. If the attractant uses another sense (meant to be smelled {winded} or seen {as in decoys}), then it is legal on public land.