Another step in colonizing Mars

As I'm a big fan of Sci-Fi and science, one dream that I hope to see it come true would be the colonisation of Mars!
The private and state agencies have started (well, a couple of years ago...) to plan and prepare for sending humans to Mars.
About this endeavour there a lot of technical and financial problems. One of them would be, how to supply the crew with food. A few scientists proposed to "live of the land" (e.g. Robert Zubrin), thus, the crew would grow their own food on the martian soil.
An experiment was undertaken by some scientist to help the future martian "settlers" to have better yields in their agricultural activity:
https://www.space.com/38960-worms-born-martian-soil-experiment.html