No way to grow food there unless you export a whole lot of greenhouses and set up an artificial biosphere, but without the conditions that we take for granted on earth.
This is already hard to do in deserts or in the Polar regions, where we have plenty of oxygen and free moisture flowing in the atmosphere.
[1]: http://abyss.uoregon.edu/~js/ast121/lectures/lec14.html for a good explanation.
No, you can build the greenhouses in-situ. We have already worked out how to produce metals and polymers from martian resources.
> This is already hard to do in deserts or in the Polar regions, where we have plenty of oxygen and free moisture flowing in the atmosphere.
Sure, there will be considerable challenges. I don't see anything that will be insurmountable.
links?
How is this relevant to growing in pressurized domes?
Conditional on there being a Mars colony in 30 years, then there will almost certainly be mineral and food exports from Mars to the rest of the solar system other than Earth in another 10.