It's difficult to not worry about demand for agricultural commodities when concerned about China's economy. The country has accounted for 65 percent of the world's total soybean exports in the current marketing year.Today's markets (grains, oilseeds, financial, energy, etc.) seemed to be reacting to the overnight meltdown in China's financial market, which was down more than 8 percent and suffered the largest one-day loss since 2007. Despite that, China's market is still up 15 percent for the year but 28 percent off its high. That is quite a ride and almost like soybeans. Now that we have again put Greece on the back burner, it's time to worry about China's growth or lack thereof. Everything took a beating today. Corn and soybeans were shar...