We cant add corn to the water, but we can add water to the corn? There have been several studies by several people, Cohen is only one group, who have been studying mallard migration now for l believe 6 years. These studies definitely prove the mallards are shortstopping, not coming near as far south. Direct ties to food sources. Mallards are very tough birds. They find food, no pressure, they stay. Plain, simple. Cold air doesn't affect them, other than make them need to feed more. They can find water on the big rivers, can also dry feed if need to. There are some big names. Clubs planting thousands of acres of corn, flooding it. Hunting edges, charging high dollar amounts to hunt. One group is charging 6200.00 for a three day hunt, that's per person, 6 duks a day, 18 total. Has a 3 yr wait list. Running big groups thru multiple blinds daily. I know of a guy not from here, in Who has bought four or five farms joined together, in west Tn. Plants lots corn, floods it. Doesn't hunt it much. Holding thousands. I have a friend who has hunted a farm that joins this big corn tract. For 30 yrs they have had same farm, never killed a hundred duks. Now stomping ever day, along with other farms that join it. He can't believe it. It absolutely does make a difference. To plant corn for harvest, on a very low end cost, 500.00 an acre would be very cheap. Seed is around 275 dollars for 2 1/2 acres, plus chemical, fertilizer, fuel. There is NO way it's a normal agricultural practice to plant corn, leave it, flood it. Yes, refuges have planted corn, but not thousands of acres. It's all about money. One other note, look at diver studies. They dont use crop fields. They still migrate. And yes, l do believe mallard numbers are down.