13. September 2018
EDEN ISS

Greenhouse braves the Antarctic: DLR researcher Paul Zabel experiences record harvest and instructive challenges

The EDEN ISS greenhouse defies Antarctic conditions
The EDEN ISS greenhouse defies Antarctic conditions
Image 1/9, Credit: DLR (CC-BY 3.0).

The EDEN ISS greenhouse defies Antarctic conditions

The Antarctic greenhouse EDEN ISS survived the polar night, as well as Antarctic storms and temperatures below minus 40 degrees Celsius. Here you can see the stairs leading to the front door.

Paul Zabel with harvested kohlrabi
Image 2/9, Credit: DLR (CC-BY 3.0).

Paul Zabel with harvested kohlrabi

By September 2018, DLR scientist Paul Zabel had harvested 12 kilograms of kohlrabi.

Antarctic radishes
Image 3/9, Credit: DLR (CC-BY 3.0).

Antarctic radishes

To date, Paul Zabel has harvested five kilograms of radish in the EDEN ISS greenhouse .

Preparing the nutrient solution
Image 4/9, Credit: DLR (CC-BY 3.0).

Preparing the nutrient solution

Paul Zabel prepares the nutrient solution for the plants at Neumayer Station III.

Strawberry plants
Image 5/9, Credit: DLR (CC-BY 3.0).

Strawberry plants

The strawberry plants grow fast in the Antarctic

First sunrise after the polar night
Image 6/9, Credit: DLR (CC-BY 3.0).

First sunrise after the polar night

Paul Zabel looks into the first sunrise after the polar night.

The path to the EDEN ISS greenhouse with a full moon
Image 7/9, Credit: DLR (CC-BY 3.0).

The path to the EDEN ISS greenhouse with a full moon

The EDEN ISS greenhouse is 400 metres away from Neumayer Station III.

Thermotransport box in front of the greenhouse
Image 8/9, Credit: DLR (CC-BY 3.0).

Thermotransport box in front of the greenhouse

The thermo transport box on the sled is used to bring the salad and vegetable harvest to the Neumayer Station III.

Signpost in the Antarctic
Image 9/9, Credit: DLR (CC-BY 3.0).

Signpost in the Antarctic

Paul Zabel at the signpost with home-made Bremen and Lübbenau signs.

  • 77 kilograms of fresh lettuce, 51 kilograms of cucumbers and 29 kilograms of tomatoes have been harvested
  • Artificial pollination is especially challenging; greenhouse technology maintained under harsh conditions.
  • Plant growth can now be viewed live on the Internet
  • 40 experiments and validation tests are currently running
  • Focus: space flight, biosystems

The Antarctic greenhouse EDEN-ISS has weathered the polar night – as well as Antarctic storms and temperatures below minus 40 degrees Celsius – in its practical test under the direction of the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR). It has been yielding herbs, lettuce and freshly harvested vegetables to the 10-member overwintering crew in the Alfred Wegener Institute’s Neumayer Station III for the first time since the beginning of 2018. After more than half a year of operation in Antarctica, the self-sufficient greenhouse concept appears to be effective for climatically demanding regions on Earth, as well as for future manned missions to the Moon and Mars. DLR researcher Paul Zabel is overcoming challenges, as well as acquiring knowledge from cultivating plants under such harsh conditions. To the overwintering team, the fresh greens are a welcome change during their long-term isolation. Zabel will report on his experiences in a live transmission from Antarctica on 13 September 2018.

Plenty of lettuce and tomatoes, few peppers, and no strawberries yet

"The harvests are now so plentiful that some of it does not always make it straight to the table, and we now have the luxury of spreading out our consumption of some refrigerated lettuce and herbs over several days,” Zabel says. “The overwintering team members are always looking forward to their next fresh meal.” Indeed, the lettuce, tomatoes, cucumbers and herbs thrive especially well under the conditions of 21 degrees Celsius and 65 percent relative humidity in the greenhouse. Seventy-seven kilograms of lettuce, 51 kilograms of cucumbers, 29 kilograms of tomatoes, 12 kilograms of kohlrabi, five kilograms of radishes and nine kilograms of herbs have been grown and harvested on a cultivation area of about 13 square metres. “What astonished us was the failed harvest for peppers and strawberries,” Zabel says. The pepper and strawberry plants grow quickly in Antarctica as well, but the artificial pollination causes some problems, whereby only a few fruits or – in the case of strawberries – none at all have been produced. EDEN ISS Project Manager Daniel Schubert adds: “The pepper plants bore ample fruit during the greenhouse trial run in Bremen last year. This shows how important and instructive the greenhouse’s extreme test under Antarctic conditions is."

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Credit: DLR

Greenhouse technology in extreme conditions

Quite often, a storm prevents Zabel from making the 400-metre outdoor trip from the Webspecial des AWI zur Neumayer-Station III to the greenhouse. Under these circumstances, the control centre in Bremen takes complete responsibility for monitoring the plants and supervising the greenhouse. However, this has been necessary on no more than three consecutive days so far, so Zabel has been able to do a good job of ensuring that the plants receive continuous care. The importance of his presence on site has been demonstrated repeatedly at times when the greenhouse technology has run into difficulties under the extreme conditions and urgent assistance has been needed. “On one occasion, for example, I had to go to the greenhouse quickly because a screw had come loose in the thermal system, and the lamp cooling was no longer sufficiently ensured.” Small repairs like these are hardly foreseeable and teach the researchers about the greenhouse concept and how to make its design more robust in future.

“It is important for us to be able to react when there are complications with the existing tools and resources on site. After all, the sound operation of a greenhouse on the Moon and Mars would be essential for survival,” says Schubert, the Project Manager. Forty different experiments are currently running in the greenhouse. This means a lot of work for Zabel, as he extensively analyses the cultivation of vegetables. His tasks include taking regular microbiological samples, examining the precise quality of the harvest, and periodically checking all systems, such as light, temperature regulation, and the nutrient- and carbon dioxide-enriched air supply. He also documents how fresh food is affecting the health of the overwintering team members.

Sharing the fun live with strawberries and peppers, and providing tips

Gaining insights into Antarctic plant cultivation has so far been reserved for the international researchers on the project, but everyone will have this opportunity in the future. “Until now, we in the control centre have received daily images of the individual plants through 32 cameras in the greenhouse. The researchers involved have access to these images and can provide the relevant tips,” Schubert says. “Now, we are opening these plant images to the public via an online tool on the EDEN ISS project website. Anyone who is interested can take part live in our vegetable cultivation in the Antarctic.” Every day, photos of the individual plant cultivation boxes are automatically taken at a specific time and under special lighting conditions. These images are then transmitted to the mission control centre in Bremen and made available online. The plant growth can be followed via an interactive timeline. In this way, people can interactively participate in a technology that will become more important in the future.

Positive effect is noticeable

Eberhard Kohlberg from the Alfred Wegener Institute, who is the logistics manager for the Neumayer Station III and has been a member of the overwintering crew on several occasions, says how pleasant it is to have a garden with lettuce and herbs just around the corner: “Otherwise, the menu just consists of long-life products from the freezer and storage room.” Only at the end of October 2018 will the first supply aircraft be able to provide the overwintering team with fresh food items from the outside world once again. Neumayer III station manager Bernhard Gropp adds: “"We greatly value and enjoy the fact that regularly fresh salad, herbs and vegetables from the greenhouse enrich our diet. The positive effect is noticeable.” The last part of the winter is particularly challenging for the crew, as they gradually have to switch back to normal operation with many people at the station.

EDEN ISS: Food supply of the future

Global food production is one of the key societal challenges of the 21st century. A rising world population and simultaneous upheavals caused by climate change require new ways of cultivating crops, even in regions with unfavourable climatic conditions. For deserts and areas with low temperatures, as well as space missions to the Moon and Mars, a closed greenhouse makes it possible to produce crops independently of the weather, the Sun and the season, while enabling lower water consumption, as well as the abandonment of pesticides and insecticides. With the EDEN ISS project, such a greenhouse model of the future is being subjected to long-term testing for one year under the extreme conditions of Antarctica.

International cooperation at EDEN ISS

The EDEN-ISS project is carried out in cooperation with the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI) as part of an overwinter mission at the German Neumayer Station III in Antarctica. Many other international partners are cooperating in a research consortium under DLR’s leadership to ensure that the greenhouse in Antarctica remains functional: Wageningen University and Research (Netherlands), Airbus Defence and Space (Germany), LIQUIFER Systems Group (Austria), National Research Council (Italy), University of Guelph (Canada), EnginSoft (Italy), Thales Alenia Space Italia (Italy), AresCosmo (Italy), Heliospectra (Sweden), Limerick Institute of Technology (Ireland), Telespazio (Italy) and the University of Florida (USA). The project is financed with funds from the European research framework programme Horizon 2020 under project number 636501.

News about the project directly from Antarctica can be found on the EDEN ISS Facebook and Instagram channels, as well as through the #MadeInAntarctica hashtag on Twitter. Information compiled about the project is available at: www.DLR.de/EDEN-ISS.

Contact
  • Falk Dambowsky
    Editor
    German Aerospace Center (DLR)
    Media Relations
    Telephone: +49 2203 601-3959
    Fax: +49 2203 601-3249
    Linder Höhe
    51147  Cologne
    Contact
  • Paul Zabel
    German Aerospace Center (DLR)

    DLR Institute of Space Systems
    Telephone: +49 421 24420-1273
    Linder Höhe
    51147  Köln
    Contact
  • Daniel Schubert
    German Aerospace Center (DLR)
    Institute of Space Systems
    Telephone: +49 421 24420-1136
    Robert-Hooke-Straße  7
    28359 Bremen
    Contact
  • Sebastian Grote
    Alfred-Wegener-Institut (AWI)
    Communications and Media Relations
    Telephone: +49 471 4831-2006
     
    Contact
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