Now NASA Wants To Grow Potatoes On Mars For Real (examiner.com)
MarkWhittington writes: In the hit movie, "The Martian", NASA astronaut Mark Watney survives by planting potatoes in one of the modules of the Mars base who is stranded at. The plot device received a great deal of praise from space agriculture experts, according to a recent story in Popular Mechanics. Of course, future space farmers would be advised to grow a variety of crops in order to diversify their diet, not an option for Watney. In any case, according to a story in ZME Science, NASA is partnering with Peru's International Potato Center (CIP) to do what Watney did and grow potatoes on Mars.
The beans don't actually add nitrogen to the soil. Legumes are used for this because they form a symbiotic relationship with a bacteria. The bacteria is the one that fixes atmospheric nitrogen into the type ready for plant uptake.