In just a few days, the calendar will turn to February. This is the time when U.S. row crop farmers begin to get serious about spring planting intentions. As usual, the key decision for many is how much of their land should be devoted to corn and how much to soybeans. A number of them have a rotational plan that has some or perhaps all of that land alternating annually between those two crops. However, most farmers, especially those with larger operations, have some land they consider as discretionary. Each year, they determine what crop to plant there based on the best net return per acre, and the decision is usually between soybeans and corn. Farmers like to make spring planting decisions in February when most seed varieties, fertilizers...