I'm assuming there is no usable fertilizer in Mars "soil" right now, and certainly a lack of the symbiotic bacteria and other critters we need to grow things th

I'm assuming there is no usable fertilizer in Mars "soil" right now, and certainly a lack of the symbiotic bacteria and other critters we need to grow things that have adapted and evolved for Earthly living conditions. We'll need to bring pretty much everything from scratch.