While USDA's 2017/18 projections of early May are vulnerable to a multitude of moving variables that will ultimately determine the actual outcome, they can be a signal of trends to come.It is hoped that yesterday’s discussion regarding projections for U.S. and world 2017/18 grain and oilseed supply/demand contained in the May WASDE (see Ag Perspectives, 10 May) did not appear to be too dismissive. USDA analysts put forth these forecasts at a time when Northern Hemisphere winter wheat crops are still actively developing and most spring planted crops are not even in the ground. Southern Hemisphere crops have become increasingly important to world supply/demand balances, and they are months away from being planted. This means that 2017/18 fore...