The market movers this week included primarily the chances for moderate to abundant rainfall in Argentina, macro concerns about economic growth, and the impending switch to South American dominance in the export market. Soybeans will be the main beneficiary of rainfall in Argentina as it will be too late for nearly half the corn crop.  Soybeans are now in a downtrend as South American production heads toward harvest. March soybeans lost ground three out of the four trading days this week, showing a cumulative decline of 21.25 cents and is now valued at 1506.5/bushel. That knocked it below prior support at 1508, which now moves that floor to 1462/bushel. March soymeal hit a contract high of 487/ST on 18 January but closed out the week...