SANTIAGO, Chile, May 24, 2011 /PRNewswire/ -- Sociedad Quimica y Minera de Chile S.A. (SQM) (NYSE: SQM; Santiago Stock Exchange: SQM-B, SQM-A) reported today earnings for the first quarter of 2011 of US$111.4 million (US$0.42 per ADR), an increase of 45.6% with respect to the same period of 2010, wh