SPREADS Most of the price action Friday and over the next 4 days is likely to be that of index fund spread activity.  March corn futures were down 47,492 contracts Fri. with May up 29,245 contracts.  Total open interest in March corn stands at 549,785 vs. May at 329,633.  March bean open interest was down 17,790 contracts with May up 16,629.  March bean open interest stands at 321,739 vs. May at 209,015.  July/Dec corn trades from 1 1/4c to 2c while March/May trades from 4 3/4c to 5 1/2c.  July/Nov beans trades from 10c to 10 3/4c, and vs. wider values week ago.  March/May beans trades from 12 3/4c to 13 1/4.  March wheat/corn trades from 1.73 1/2c to 1.79c .   May crush falls to 98c/bu as...