Assuming that life doesn't exist on Mars, the soil is going to be very poor for growing plants, so manure and other fertilizers will be valued highly in any Martian civilization until the planet changes enough chemically to support growing vegetation on its own.
source- http://en.wikipedia.org/wiki/Colonization_of_Mars
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Wasted and wounded, it ain't what the moon did
Got what I paid for now
See ya tomorrow, hey Frank can I borrow
A couple of bucks from you?
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