OSLO--Norwegian chemical company Yara International ASA (YAR.OS) said Tuesday that Jørgen Ole Haslestad has resigned as Chief Executive Officer amid merger talks with U.S. fertilizer producer CF Industries, and that it had appointed Torgeir Kvidal as acting Chief Executive Officer.

"Yara's Board has concluded that Haslestad is not the right person to lead the company going forward, also in light of the on-going talks with CF Industries," said Yara Chairman Leif Teksum, adding that Mr. Haslestad "would not have a role in a potential merged company."

Mr. Haslestad, 65, has been in his position since 2008, and has previously announced that he planned to retire when Yara had appointed a new chief executive officer.

Oslo-based Yara and CF Industries, based in Deerfield, Ill., said last month they were in merger talks to form the world's biggest producer of nitrogen fertilizers, combining Yara's international distribution network with CF's low production costs based on cheap U.S. natural gas.

No information was given about whether the merged company would be based in Norway or whether the company's chief executive officer would be Norwegian. The Norwegian government is Yara's biggest shareholder with a 36.21% stake, and has previously said it wanted Yara's headquarters to remain in the country.

Svein Richard Brandtzæg, chief executive officer of Norwegian aluminum producer Norsk Hydro ASA, reconsidered on Sept. 26 a previous decision to become Yara Chief Executive officer, and said the company's merger plans were partly to blame, along with an improvement in the aluminum market and a wish from Norsk Hydro to keep him.

"The discussions with CF Industries will continue with Kvidal leading the Yara team, with support from the board and in particular from me as chairman," said Mr. Teksum.

Mr. Kvidal has been Yara's chief financial officer since 2012 and served as the company's head of supply and trade from 2011 to 2012. He joined Norsk Hydro in 1991, before the Yara demerger in 2004.

Write to Kjetil Malkenes Hovland at kjetilmalkenes.hovland@wsj.com

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