The premise of The Martian is that the character in the movie is stranded on Mars and must survive on an "all potato" diet for the next four years before a rescue mission can arrive. He has to be able to grow enough potatoes for his own survival on the red planet. How he's going to cook them, I don't know?
Trapped on Mars: Matt Damon's incredible new movie 'The Martian' shows how man could survive on the red planet"The botanist only has a few weeks of supplies to provide himself subsistence for the four years he would need to stay alive to be rescued.
Watney hatches a plan to grow his own food by converting the floor of the research station into a field.
The film shows him using sprouts from potatoes the astronauts brought along for a Thanksgiving meal.
This involved calculating how many calories he would need to survive four years - 2,137,500 - and how many potatoes that requires, as well as how much land would be needed.
In reality, Mars is a relatively ideal place to put up a greenhouse, according to Nasa.
The day and night cycle is almost identical to Earth's, and the total solar energy hitting the surface is enough for a plant's needs.
In the film, potatoes are used, because they are the best calorie yield per land area.
6 TIPS FOR SURVIVING ON MARS, BY 'THE MARTIAN' AUTHOR ANDY WEIR
Tip #5
5 - You’re going to need food
Just think of how much food you eat in a year and imagine how much space it takes to grow it. Hope you like potatoes."