China Daily Global Edition (USA)
Road tunnel gets ‘smart’ with vertical crop farm
OKCHEON, South Korea — Behind a blue wall that seals a former highway tunnel stretches a massive indoor farm bathed in rose-tinted light.
Fruits and vegetables grow hydroponically — with no soil — in vertically stacked layers inside, illuminated by neonpink LEDs instead of sunlight.
Operators of this high-tech facility in South Korea say it is the world’s first indoor vertical farm built in a tunnel. It’s also the largest such farm in the country and one of the biggest in the world, with a floor area of 2,300 square meters, nearly half the size of an American football field.
Indoor vertical farming is seen as a potential solution to the havoc wreaked on crops by the extreme weather linked to climate change and to shortages of land and workers in countries with aging populations.
The tunnel, about 190 kilometers south of Seoul, was built in 1970 for one of South Korea’s first major highways. Once a symbol of the country’s industrialization, it closed in 2002. An indoor farming company rented the tunnel from the government last year and transformed it into a “smart farm”.
Instead of the chirrups of cicadas, Claude Debussy’s Clair de Lune resonates in the tunnel in hopes of stimulating the crops’ healthy growth.
“We are playing classical music because vegetables also love listening to music like we do,” said Choi Jae-bin, head of NextOn, the company that runs the vertical farm.
Sixty types of fruits and vegetables grow in optimized conditions using NextOn’s own growth and harvest systems. Among them, 42 are certified as no-pesticide, no-herbicide and non-GMO products, said Dave Suh, NextOn’s chief technology officer.
He said the tunnel provides temperatures of 10 to 22 C, enabling the company to optimize growing conditions.
High-tech smart farms, used also in places like Dubai and Israel where growing conditions are challenging, can be a key to developing sustainable agriculture, experts said.
“Society is aging and urbanization is intensifying as our agricultural workforce is shrinking,” said Son Jung-eek, a professor of plant science at Seoul National University. Smart farming can help address that challenge, he said, as well as make it easier to raise high-value crops that are sensitive to temperature and other conditions.
The crops will cost less than conventionally grown organic vegetables, Suh said.
The farm will begin supplying vegetables to a major food retailer and a leading bakery chain beginning in late August, NextOn said.
Next up: More tiers of crops in the remaining two-thirds of the tunnel to grow high-value fruits and medicinal herbs.
Suh said the medicinal plant market is currently dominated by a few countries and regions.
“Our goal is to achieve disruptive innovation of this market by realizing stable mass production of such premium crops,” he said.