Future colonists (who live in domes), will need to cultivate their own food .They could use a hydroponics approach. They also could use single cell protein (edible nonpathogenic Microorganisms are cultivated on nutrient broth and than processed into food, or meat cultivated as tissue culture from pluripotent stem cells. Regardless of which agricultural method these future colonists use, they will need to use fertilizers from mars that have all the necessary elements. Have NASA Astrobiologists evaluated Martian geology regarding availability of essential agrochemicals?