Dec 20 Corn closed at $3.4175/bushel, down $0.03 from yesterday's close.  Sep 20 Wheat closed at $5.075/bushel, down $0.09 from yesterday's close.  Nov 20 Soybeans closed at $9.1375/bushel, down $0.015 from yesterday's close.  Dec 20 Soymeal closed at $303/short ton, down $2.1 from yesterday's close.  Dec 20 Soyoil closed at 31.9 cents/lb up 0.37 cents from yesterday's close.  Oct 20 Live Cattle closed at $109.875/cwt up $0 from yesterday's close.  Sep 20 Feeder Cattle closed at $145.6/cwt up $1.2 from yesterday's close.  Oct 20 Lean Hogs closed at $51.425/cwt down $2.1 from yesterday's close.  Sep 20 WTI Crude Oil closed at $42.57/barrel down $0.32 from yesterday's close.   ...