By fertilizing inorganic regolith with organic human waste that has been processed through bioreactors, future astronauts living on Mars could be able to create their own organic soil.

Lessons from 'The Martian': How astronaut poop could help us settle the Red Planet

Source: space
Source Link: https://www.space.com/astronomy/mars/lessons-from-the-martian-how-astronaut-poop-could-help-us-settle-the-red-planet