SPREADS Sep/Dec corn spreads continue to have heavy volume, with nearly 80K traded Monday, and is trading from 12 1/4c to 12 1/2c today.  The spread traded out to 13c before encountering short-covering activity.  Short-covering was noted in corn yesterday, with September open interest declining by 31,196 contracts, while March picked up 12,656 new contracts.  Bean spreads remain fairly quiet with Sep/Nov trading from 2 1/4c to 3 1/4c carry.  Sep/Dec meal spreads are slightly narrower trading into $4.80 from $5.40.   PALM OIL Prices gained on Tuesday after data showed that Malaysia's July exports grew 20% on the year to hit a record high of 1.78 mmt according to CGS-CIMB.  Cash offers for RDB palm and ol...