South Pole Greenhouse Grow Vegetables for Space

EDEN ISS greenhouse at the South Pole. (Credit: DLR)
EDEN ISS greenhouse at the South Pole. (Credit: DLR)

The menu for polar explorers in the Antarctic is not usually very exciting. Often, there are only durable goods, especially in the polar winter, when the researchers are cut off from the outside world for months. But by the end of next year, the EDEN ISS greenhouse will supply the German Neumayer III polar station with fresh fruit and vegetables. It will also test how fresh plant-based food could be cultivated on the International Space Station ISS and during future missions to the Moon and Mars. The not quite so everyday Antarctic container has arrived at the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) site in Bremen and its conversion into a self-sufficient biotope for salad, herbs, cucumbers and maybe even strawberries. DLR researcher Paul Zabel is already preparing for his extraordinary mission to the End of the World.

Defying the Arctic Winter

A great deal of state-of-the-art technology is required to cultivate plants at the South Pole. “First of all, we need to provide the basic needs of the plants in the polar greenhouse, which cannot be taken for granted in the Antarctic,” says Zabel, of the DLR Institute of Space Systems. “Pipes to supply sufficient water, lamps to provide the right light and even filters and nozzles for a growth-promoting air mixture must first be laid and installed.” During the Antarctic winter, the environment is extreme and hostile to life. Temperatures drop to minus 30 degrees Celsius and no sunlight breaks the darkness of the polar night for months. The greenhouse has particularly effective insulation, as from December 2017 onwards it must defy Antarctic conditions.

Plant Cultivation Without Soil

An essential factor for horticulture in extreme conditions is having the right water supply. Large water tanks are therefore installed in the floor of the greenhouse container. In the eternal ice, these are then filled with previously melted, filtered and purified water from the Neumayer III Antarctic station operated by the Alfred Wegener Institute (AWI). “The water is not fed directly to the plants but is rather computer-controlled to add a special nutrient solution,” explains Zabel. “Every five to 10 minutes, the plants are sprayed automatically with the water-nutrient mixture so that they can be cultivated completely without using soil.” The process, called aeroponics, basically saves the transportation of large quantities of soil.

Sterile Air with Increased Carbon Dioxide Content

The air in the greenhouse will be adapted as much as possible to the needs of the plants. For this purpose, bottles of carbon dioxide will accompany the container to the Antarctic to enrich the carbon dioxide content in the greenhouse air. “It will be crucial to keep the air free of harmful germs and fungal spores,” says EDEN ISS Project Coordinator Daniel Schubert from the DLR Institute of Space Systems. “To do this, we are installing various air filters as well as a system for air sterilisation using UV radiation.” Like a space station, the greenhouse will have a completely closed air circuit, including an airlock through which Zabel will enter the greenhouse every day. The closed circuit also allows all the water that the plants release into the air to be recovered and fed back to them. “I will, so to speak, only take the water that I harvest out of the greenhouse with the ripe fruit. The rest will be reused,” adds Zabel.

Special Light for Every Plant

To survive in the polar night, the plants, in addition to air, need a nutrient-water mixture and a blue and red light cocktail, which makes vials and plants glow violet. “In order to grow each plant species individually, we are building water-cooled LED systems in which each LED can be individually controlled via a computer,” explains Schubert. The plants will be illuminated for 16 hours in an implied day-night rhythm and will have eight hours of nightly rest without light. Engineer Zabel also needs the right light in Antarctic darkness: “In addition to the dim LED light, there will be a white light for me, so that I can hopefully work well in the greenhouse.”

The installation of basic supplies will be completed around Christmas, followed by the working area, the changing room and the computer technology required for Zabel’s stay by spring. After that, a trial will start at the DLR site in Bremen, before it is shipped en route to Antarctica in October 2017.

Preparations for the Dress Rehearsal on Ice

Since 2011, the DLR Institute of Space Systems has been researching the artificial conditions under which salads or cucumbers flourish and taste best in the established EDEN laboratory. The Antarctic will be the field test for whether plant cultivation in total isolation is successful. For DLR researcher Zabel, it will be a very personal challenge to hold out for a year in the eternal ice. He is currently intensively studying the art of plant cultivation at Wageningen University in the Netherlands, one of the project‘s partners. In the summer of 2017, there will also be a first trial cohabitation for the entire overwintering crew in Bremerhaven and then a challenging survival training course in the Alps.

The Partners

For the greenhouse to be able to operate in Antarctica, numerous international partners are working together under the leadership of DLR: In addition to the Alfred Wegener Institute (Germany) and Wageningen University and Research (Netherlands), Airbus Defence and Space (Germany), LIQUIFER (Austria), the National Research Council (Italy), the University of Guelph (Canada), Enginsoft (Italy), Thales Alenia Space (Italy), Aero Sekur (Italy), Heliospectra (Sweden), Limerick Institute of Technology (Ireland), and Telespazio (Italy) are part of the EDEN ISS project consortium.

  • JamesG

    I wonder how they got this around the Antarctic Treaty’s “Invasive Species” Article? I recall morale took a big hit at McMurdo when they made everyone give up their houseplants and little room herb gardens to comply with it… Did someone realize it was ridiculous? Just by calling them “food”? LOL…

  • Hug Doug

    That article doesn’t apply to food.

  • Diesel generators in space, that’s the way to go!

    Reminds of Biosphere iI with its 5 megawatt gas generaotr sitting outside the dome.

  • JamesG

    Read it again.

  • passinglurker

    There is a difference between a makeshift planter box in a dorm room and a dedicated and secured science unit like this green house.

  • JamesG

    Not when both are surrounded by an extremely hostile environment.

    What do you think is going to happen when the produce and fruit (seeds!) are taken to the kitchen. Is Herr Zabel going to stand over the cook’s shoulder and make sure every seed and rootable stem is accounted for?

  • Hug Doug

    Yeah, I don’t see where something like that would be prohibited by the Antarctic Treaty, in Article IX or anywhere else in it.

    Annex II, Article 4, section 5 (page 43 of the pdf):

    “Nothing in this Article shall apply to the importation of food into the Antarctic Treaty area provided that no live animals are imported for this purpose and all plants and animal parts and products are kept under carefully controlled conditions and disposed of in accordance with Annex III to the Protocol and Appendix C to this Annex.”

    (page 45 and 46 of the pdf)

    2. The importation of non-sterile soil shall be avoided to the maximum extent practicable.”

  • passinglurker

    Sounds tough maybe there are food preparation facilities in the container? either way putting up with the red tape to prove the system would just be the scientist earning their pay they didn’t get a degree in sloppyology after all

  • windbourne

    Spot on with a greenhouse.
    However, we need to bring more equipment to test there.
    For starters it makes sense to bring a Bigelow BA-330 unit there, along with mars suits. Then add in a small nuclear reactors. That is allowed by our treaties. There are several in development that are small single units of 1-2 MW size. These are actually smaller that the greenhouse. And they can use the waste heat for heating the housing.

  • windbourne

    there are several small 1-2 MW nuclear reactors under development.
    Far better to go that route.

  • windbourne

    well, hopefully, sanity will prevail and this will stay. In fact, something like that should go to McMurdo as well.

  • Sure, that will make for cheap veggies and will run the air conditioners in the Biosphere 2.

  • JamesG

    But yet, they yanked all of the plants out of McMurdo because of it.

  • Hug Doug

    Probably anything in non-compliance with section 2 of Appendix C.

  • Hug Doug

    They already have (possibly had? per James) a greenhouse. This is an aeroponics experiment.

    “it makes sense to bring a Bigelow BA-330 unit there, along with mars suits.”

    No, it doesn’t. We’ve been over this before.

  • Hug Doug

    Do you have any articles you can cite about the plants being pulled out of McMurdo? I’m not finding anything in searches. Several articles about the greenhouse there, but nothing about it (or the plants) being removed.

  • Hug Doug

    Interesting. Found an article (from 2015) that says Palmer station no longer grows fresh produce, but South Pole and McMurdo still do.

    “Until a decade ago, chefs could grow fresh herbs such as cilantro, sprouts and basil inside Antarctic research stations. The two other US bases, South Pole and McMurdo, still maintain greenhouses today. But because Palmer Station is north of the Antarctic Circle, scientists worry stray seeds from the herbs could potentially grow in the summertime, spreading invasive species on the continent. To eliminate this threat, Palmer Station has banned the practice.”

  • delphinus100

    We had a nuclear reactor there, too…with mixed results.

  • JamesG

    No. This was years ago, and a Nat. Geo mag story about how they made everyone at ALL US Antarctic bases get rid of any plants or animals. I just distinctly remember being the old, “pre-legoland” McMurdo where they described managers having to go room to room searching for any plants because people refused to give them up.

  • Hug Doug

    Well, it would have had to have been in 1998 or shortly prior, because that’s when the Protocol on Environmental Protection part of the Antarctic Treaty went into effect. I’m not finding anything on plants being removed from McMurdo or South Pole, just Palmer station. Maybe it was a story about one of the dozens of other Antarctic bases.

  • JamesG

    I donno. It was just what came to mind when reading the above article.

  • windbourne

    yeah, back in the 60s and with early tech.
    Now, we can build clean ones.