OSLO--Norway's Yara International ASA and U.S.-based CF Industries Holdings Inc. are in merger talks to form the world's biggest producer of nitrogen fertilizers with over $18 billion in annual sales, the companies said Tuesday.

A merger would create one of the biggest players in the global fertilizer market, boosting the companies" negotiating power with producers of fertilizer ingredients like phosphate and potash. The combined market cap of Oslo-based Yara and Deerfield-based CF Industries would be $26.3 billion, slightly below the $28.9 billion market cap of Canadian fertilizer giant Potash Corp of Saskatchewan, the world's largest producer of potash.

RS Platou Markets analyst Per Haagensen called the potential tie-up "a perfect match" that would help Yara expand its foothold in the U.S. while giving CF Industries access to Yara's significant international distribution network.

The North American market is attractive for fertilizer companies due to its cheaper shale gas supplies, a key input factor in fertilizer production. Yara has sought to boost its presence there beyond last year's 14% of total sales and plans to build an ammonia plant in Freeport, Texas with German chemical giant BASF SE.

Yara in a statement described the talks as "a potential merger of equals, " adding that the discussions are "at an early stage" and that there were no assurances they would result in a deal. CF Industries published a similar statement.

The companies have butted heads over deals before. CF Industries in 2010 outbid Yara to purchase Terra Industries Inc. for $4.7 billion, in a deal that formed one of the world's biggest nitrogen fertilizer makers. In 2013, CF Industries recorded sales of $5.47 billion while Yara reported sales of $13.4 billion.

Yara recently acquired fertilizer producer OFD Holding Inc., strengthening its presence and distribution network in Latin America and complementing a previous $750 million acquisition of Brazilian fertilizer producer Bunge Ltd. (BG).

CF Industries operates seven nitrogen fertilizer manufacturing complexes in the central U.S. region and Canada and a network of distribution terminals and warehouses, mainly in major grain-producing states in the Midwest. Yara has operations in over 50 countries and sales to more than 150 countries.

A merger must be approved by Yara's biggest owner, the Norwegian government, which owns a 36% stake. The government has said it won't reduce its stake in Yara below 34%, but declined to comment Tuesday on whether it was ready to spend any money to maintain the current stake. The second-biggest owner of Yara is the state-controlled Government Pension Fund Norway with a 4.72% stake.

The talks follow a string of recent steps by the Norwegian government to reduce its ownership in some firms. The government owns about a third of the shares listed on the Oslo Stock Exchange, including a 67% stake in oil giant Statoil ASA (STO).

The government said Monday it was prepared to sell its 59.17% stake in Oslo-listed salmon farmer Cermaq ASA to Mitsubishi Corp. (8058.TO), in a deal valuing the company at 8.88 billion Norwegian kroner ($1.40 billion). That followed an announcement on Sept. 17 that it planned an initial public offering of fully-owned real-estate company Entra, in what could be the biggest listing on the Oslo Stock Exchange since 2010.

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

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