Grain trading in general today has been poor, but with the noted exceptions. This chart of corn is a good example. Both soybeans and wheat have both manifest wider than usual spreads, making it more difficult to trade profitably.
I have preferred to trade the 10-year Treasuries and S&P 500 mini today. Both have remained very liquid and have shown excellent movements that were reliable. I also like trading these two instruments because even if I traded 100 contracts, it would barely budge the price. It is extremely difficult for any party to influence prices by themselves.