BUZZ-CF Industries Holdings Inc: Merger talks with Norway's Yara
** Fertilizer producer's shares up 3 pct at $263.36 in morning trading
** Norway's Yara International ASA and CF Industries in talks about merger of equals
** Merger to create a $27.5 billion global fertilizer producer to rival world No.1 Potash Corp
** CF Industries to gain global footprint through Yara's presence in 150 countries with production assets and a well established distribution network
** Till Monday's close, CF Industries shares had risen 10 pct this year
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