China and weather are the topics that have dominated market chatter for the last several weeks, but they have not generated a breakout movement of grain and soy futures prices. Talk about a U.S.-China trade agreement has been going on for months, long enough to become tiresome. Both sides speak optimistically about the progress being made, and they predict one will be finalized soon. After so much time, though, such talk no longer moves prices. Traders have adopted a “show me” attitude. However, if China’s agricultural purchase commitments under such a deal are as big as rumored, the final agreement will almost certainly become a market mover. Abundant wet weather, including a few bizarre spring blizzards, has stymied pla...