BUZZ-Agrium Inc: Hedge fund ValueAct buys 5.7 pct stake
** Canadian fertilizer producer's shares up 7 pct at C$103.73; U.S.-listed shares up 7 pct at $92.26
** Activist hedge fund ValueAct Capital discloses a 5.7 pct stake in Agrium, according to a filing with the U.S. Securities and Exchange Commission
** ValueAct, whose other investments include acquisitive drugmaker Valeant Pharmaceuticals Inc, did not disclose any steps it wants Agrium to take
** Agrium, which produces nitrogen, potash and phosphate, recently warned that its second-half profit would miss expectations
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