What does growing potatoes on Mars mean for Earth’s farmers? In the movie The Martian, Matt Damon plays a stranded astronaut who has to grow his own food on the red planet. (Giles Keyte/Twentieth Century Fox/Thinkstock)
What does growing potatoes on Mars mean for Earth’s farmers?
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Matt Damon made it look easy in the Hollywood blockbuster, but Mars and Earth aren't really all that different after all.

In the blockbuster movie "The Martian", Matt Damon plays Mark Watney. He's a brainy botanist who coaxes spuds to sprout in otherwise lifeless dirt.

As the population rises here on Earth, there are plenty of harsh, foodless environments. The environments could be improved with a little ingenuity. The plot is rooted in plausible science. It turns out that much of what Damon's character did to turn his Martian "hab" into a makeshift greenhouse is applicable here.

The film's release dovetails with the United Nation's International Year of Soils. The film probably does as much to raise awareness that soil, like water, is a limited resource. That's according to Harold van Es. He's a soil scientist at Cornell University.

Soil is created when glaciers, wind or other elements slowly transform rock materials into something softer and more fertile. Scientists say it can take 200 to 400 years to form one centimeter of new soil. Meanwhile, human actions are causing soil erosion and degradation at alarming rates. These include slash-and-burn agriculture, deforestation and global warming. Also, arable soil also gets lost to pollution.

"Going to Mars is a very interesting prospect.  But ultimately that will be very difficult," van Es says. "We need to learn to live with larger numbers of people on this planet."

The movie depicts Watney taming inhospitable Martian soils. First, he creates water from rocket fuel. This is perfectly reasonable science. That's according to Jim Bell. He's a planetary scientist from Arizona State University. He is an expert on Martian dirt. That water comes in handy for rehydrating freeze-dried human feces. Watney uses it as fertilizer. (In the book, Watney also adds some fresher supplies to the mix.)

Poop isn't that far fetched as a soil amendment on Earth. Washington, D.C., is among a growing number of cities turning what's flushed down toilets into compost. The city's garden plots are already using that nitrogen-rich compost. It is used to improve depleted urban soils. It can grow a mean tomato.

One of van Es' students is also using treated toilet materials to grow food. He is using it in Nairobi, Kenya. There, a legacy of growing maize has depleted the soils over time. Charred to stabilize it, the processed human waste can infuse nitrogen. This puts necessary minerals back into the soil.

Watney had to conserve every drop of water he created on Mars. He even used a futuristic water reclaimer. It is similar to what real-life astronauts use. They use it on the International Space Station to recycle their wastewater.

We also do this to some extent on Earth, where so-called gray water that washes down bathroom sinks is recycled to water golf courses and keep machinery from overheating. As drought stretches on in much of the American West, gray water isn't just recycled for irrigation but is increasingly being marketed as drinking water as well, after treatment steps that include filtering and UV exposure.

One issue "The Martian" didn't address is that on the real Mars, astronaut farmers would have to contend with contaminants in the dirt. In 1999, NASA's Phoenix lander discovered a nasty material called perchlorate in Mars soil that's "very harmful to life as we know it," Bell says.

Back on Earth, farmers in some areas have already had to deal with potentially dangerous pollution. Many urban soils contain traces of their industrial pasts in the form of lingering lead or arsenic. The most common solution involves piling untainted soil on top or into growing containers.

But closed-loop systems show great potential for working around poor soils or actually improving them. This includes hydroponics that grow fish and plants in symbiosis, or systems that rotate crops to infuse nutrients back into the soil.

Scientists also are learning how to grow crops in the radioactive environments associated with planets that lack Earth's atmospheric protection. Nuclear power plant accidents, if you can say they have a silver lining, have given researchers the chance to discover crops that thrive in radioactive soils. Oil-rich flax plants, for example, flourished near Russia's Chernobyl Nuclear Power Plant.

But human ingenuity aside, the best path to a flourishing future food supply is to not waste the resources we have in the first place.

"The movie brings out the idea that human life really depends on our ability to produce food," says van Es. "We take that for granted."

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COMMENTS (8)
  • victoriak-ver
    3/30/2016 - 08:43 a.m.

    This was a very interesting passage because it makes me realize how much we really do take for granted water and food. Also, it shows how creative some people are in saving our resources.

  • travism-knu
    3/30/2016 - 01:56 p.m.

    I think it would be a huge step if we could set up some sort of base to grow food and could have humans in it.

  • joey0111-byo
    3/30/2016 - 09:27 p.m.

    Mars and Earth are similar, because they both have machines on them. Mars has the mars rover, and we have many cars. Also, they both once had life.

  • Steve0620-yyca
    3/30/2016 - 10:41 p.m.

    I didn't know that people were trying to plant things from lifeless soil. They are using different types of ways to try to use the soil for their benefit. There is a movie called "Martian" that was played by a man named Matt Damon who tries to plant things in lifeless soil. Many of the soil are polluted by some harmful material.
    Earth and Mars are similar because there is a possibility for life to be on Mars or for people to live on Mars. Many scientists have been trying to find different ways for this and they are still discovering some more ways.

  • lucasl-3-bar
    3/31/2016 - 12:13 a.m.

    The article states that farming on Mars, in several ways, is similar to farming on Earth. This similarity, in fact, is just one of many that link Mars to Earth, contributing to its viability as a future planet to colonize. From volcanic activity to geological features to ice caps, Earth and Mars are similar in many ways. The article was a very intriguing and prominent field of study for scientists as astronomy and technology develop. It shows how, despite many differences, Mars could be a potential planet to colonize in case Earth suffers a major disaster.

  • mitchells-ver
    4/01/2016 - 02:51 p.m.

    This shows a lot on how someday we could make this a reality just like the movie The Martian.

  • brookew-fly
    4/03/2016 - 10:00 a.m.

    It is great that people can have more food when we use up the resources on Earth. Mars and Earth have similar soil, which produce like potatoes can be grown in.

  • vincents-1-bar
    4/11/2016 - 06:29 p.m.

    The article states that farming on Mars, in several ways, is similar to farming on Earth. This similarity, in fact, is just one of many that link Mars to Earth, contributing to its viability as a future planet to colonize. From volcanic activity to geological features to ice caps, Earth and Mars are similar in many ways. The article was a very intriguing and prominent field of study for scientists as astronomy and technology develop. It shows how, despite many differences, Mars could be a potential planet to colonize in case Earth suffers a major disaster.

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