I recently had the chance to meet Professor Mori Yuichi of Mebiol, an agriculture technology company in Kanagawa. This research professor at Waseda University started Mebiol in 1995 exploring first medical and then agriculture uses for hydrogels. I was intrigued by his Hymec system for indoor farming and Skygel for rooftop gardens.
Hymec looks like a plastic sheet allows for no-soil and low-soil farming, with the water and fertilizer separate from the plants roots. The roots remain dry while drawing water and nutrients from below the membrane, and oxygen from the air. Lettuce and other leaf vegetables can be grown with no soil, tomatoes with a thin layer of soil. Compared to other indoor farming techniques, Hymec uses less water, less fertilizer, less insecticides and less energy because the barrier prevents contamination from bacteria common to traditional hydroponics. Benefits include the ability to plant smaller seedlings (called “plug seedlings”), greater plant density, and more nutritious and sweeter vegetables, with tomatoes producing more Gaba and Lycopene.
I was intrigued by what Professor Mori calls “mobile farming.” In his words, “Hymec releases farming from the earth by a water-proof sheet” and allows farming in cities, factories, deserts, indoors, and even in waste incinerators. Some applications are the Kyoto Brighton Hotel, where tomators are grown on a concrete floor in a bamboo greenhouse, and a test farm in Dubai, where Hymec makes possible low-water farming with reduced air conditioning, and replaces costly and carbon-heavy vegetable imports from Europe.
Another Mebiol product is Skygel, mixed with soil and used for roof and slope planting. In this case, the hydrogel increases water retention, lowers run-off, and decreases the need for irrigation. Mixing Skygel and soil allows for a lighter load, ideal for roof gardens. The roof garden at Mebiol’s office (in top photo, with founder Professor Mori), is only 10 cm thick, and the plants can survive for up to 10 days without water in the Japanese summer heat.
Below is a diagram explaining Hymec.