Brooks - How big is your open field/plot? If the pressure in your general area is light or you can hunt it without the deer knowing it, I would think you would get bucks entering the food plot in daylight if you can consistently get a bunch of does there. I would concentrate on finding what they like best and/or giving them a bunch of options. We moved to our place in SE MN 2 years ago and there's about 10 acres of open ground that I rent out most of to a farmer and I plant plots around the perimeter. Last year it was a wet spring, so the farmer didn't get it planted in time and I could plant cover crops as part of the crop insurance preventive planting rule. It worked out great because I was able to plant a dozen different types of food plot plants and it worked great. The soybeans were by far the best, but having a little of everything made it the one stop shop for all the does in the area. They ate there early every night since I could slip in and out without being detected and when the rut came, the bucks came out. I didn't have to worry about visual screens, line of movement, etc. because all the does ate there early every night and every buck in the area knew it. The older bucks always came out last, but they weren't able to just watch 10 does feeding there every night without giving in and chasing them. The field they used most often is about 5 acres, which made it really tough to bowhunt because it was tough to get a deer in range. But it worked awesome for gun hunting.
This year the farmer planted corn on the majority of the open ground and I planted a strip of beans along the edge. The deer really didn't seem to like this setup as well as they did the prior year when they had a ton of options in one plot. Once the corn was picked the doe groups fed heavily during daylight, but it wasn't as good as the prior year with all the different options.
On my hunting land in WI the deer really prefer the soybeans as well, but the general baiting, small game hunting, bear hunting, etc. makes daylight buck movement in food plots practically non-existent. If you have that kind of hunting pressure in your general area then you might be better off putting stands in the thick stuff bordering your fields and making some shooting lanes with clover that can act as a staging area.
If you get decent daylight doe activity in your plot already, I would look at finding the right food that draws them in or possibly making your plot larger so you can give them more options.