LONDON (Reuters) - Europe's largest retailer Carrefour SA CARR.PA has adopted blockchain ledger technology to track and trace chicken, eggs and tomatoes as they travel from farms to stores, and will deploy it across all of its fresh product lines in coming years.

The French retail giant said it will rely on blockchain technology developed by IBM IBM.N, which is working with a number of retailers, logistics firms and growers to roll out systems to secure their global supply chains.

IBM Food Trust allows the industry to track and share information on how products are grown, processed and shipped. The technology cuts the time for checking the provenance of food from days or weeks to seconds, IBM said.

Blockchain, best known as the technology underlying cryptocurrency bitcoin, is a shared record of data kept by a network of individual computers rather than a single party.

Proponents say it has the power to transform industries from finance to real estate, but so far there have been few examples of its large-scale application.

Carrefour Secretary General Laurent Vallee said the group would widen its use of the system to its 300 fresh products across the world by 2022, securing a safe supply chain and allowing customers to trust in their food.

“The key thing for us as Carrefour is to be able to say when there is a crisis that we have the blockchain technology, so we are able to trace products and tell the story of the products,” he told Reuters.

Slideshow ( 2 images )

Outbreaks of salmonella linked to eggs and poultry are a major challenge for the food industry.

Nearly 207 million eggs from a North Carolina farm possibly contaminated with the organism were recalled in April, while the number of salmonella food poisoning cases in the European Union is rising.

Global businesses will pay around $212,000 a year for full use of Food Trust, which is now available worldwide, IBM said.

Still, mass adoption of the technology could face hurdles, said Simon Ellis of U.S.-based market research firm IDC.

“The efforts to convince growers to participate is not a minimal one,” he said. “Growers and farmers exist at dramatically different levels of technological sophistication.”

Pork processing giant Smithfield Foods SFII.UL is among other firms joining the project, IBM said, while science and technology companies contributing data to the blockchain now include Minneapolis-based 3M MMM.N.

Walmart Inc WMT.N said last month it would ask leafy greens suppliers to implement real-time, farm-to-store tracking using IBM's technology.

Last year, 10 retail and food companies including Nestle SA, Unilever Plc ULVR.L and Tyson Foods Inc TSN.N joined the project.