If you really want to do some scientific research. Fertilize and lime a alfalfa/clover field to the recommendations per soil test. Then monitor the deer activity increase in this plot compared to the rest of the surrounding alfalfa/clover fields. I can bet you the deer will prefer this field to all others alike.

But, as mentioned above, you will never detract deer from corn/soybeans/brows. Deer need a variety, just think if you had the oppertunity to eat corn on the cob for the rest of your life, I bet it wouldn't last too long.