“Where did those acres go?” That’s the question analysts around the world are asking in the wake of toady’s USDA reports. The reports, which were expected to show a modest decrease in corn acres and an increase in soybean plantings, instead showed decreases in both crops. The March plantings report estimated 88.026 million acres would be planted with corn this year, and 88.982 million to soybeans. This marks the first time since 1984 that soybean area has exceeded corn. 

The corn acreage number was on the low end of pre-report estimates while the soybean acre number was below the bottom end of the pre-report range. In fact, one of this analysts’ models forecasted soybean acreage of 88.85 million acres,...