BUckslayer, Adding feed -plots or feeders to any plot of land will normally increase the number of deer you see, but this is not always true. If there is plent of natural feed, they may not hit your spots.
We feed year round, sometimes they come to the buffet, sometimes they avoid it for months. Its awful dry here most of the time, when we have lots of rain like we did this past summer and fall it makes a good acorn crop. When the acorns start hitting the ground, they don't come to the corn. I even mix a Purina Game feed with the corn, it doesn't help much. I've had good luck with mineral blocks and Paymaster Feed Blocks. I have seen them wipe a feed block out over night, normally they last a week or so. The mineral block is mostly salt, but also has all the good stuff to help produce big anthlers. I always keep several of them out.......