I found an interesting article on soil.  When farmers use up their topsoil it can take years to replenish it, could it be a possibility to get that soil from Mars?  It seems a little far-fetched, but read the following article and comment on what you think.

Mars Soil Resembles Veggie-Garden Dirt, Lander Finds

Soil near the north pole of Mars is surprisingly Earthlike, with a pH not unlike many vegetable gardens, according to preliminary results from the Phoenix Mars Lander.

“You might be able to grow asparagus in it, but strawberries, probably not very well,” said Samuel Kounaves, a chemistry professor at Tufts University, during a NASA press conference this afternoon.

Previous data from the two rovers exploring Mars’s equatorial zones had suggested that the geochemistry on the red planet might have been too acidic to support most forms of Earth-type life.

But as little as an inch (2.5 centimeters) beneath the surface, dirt from Mars’s arctic plains proved to be very similar to alkaline soils on Earth, with a pH between 8 and 9. The pH scale goes from 0 (acidic) to 14 (alkaline).

The finding is good news in the hunt for signs that Mars was or could now be habitable.

“This means there is a broader range of organisms that can grow [in it],” said Kounaves, who works with the lander’s Microscopy, Electrochemistry, and Conductivity Analyzer (MECA).

“But Mars is a huge place, whose soils might differ radically from spot to spot,” Kounaves said. “We have to remember that we’re looking at tiny areas.”