If you plant two crops of silver beet and destroy the harvests you can generally assume healthy soil. Do not, of course, plough the harvests back in or you've done nothing. Silver beet is great food, grows quickly anywhere and is something a GM can happily make the PCs sick of in no time flat.
I've always disliked urban farming when it's obvious that good farming areas are nearby and untilled. It then makes no sense to stay in an urban area, so if you really want to have urban farming the GM has to make it make sense. Either/and;
- Chemical attacks have poisoned the ground and groundwater outside the city.
- The rural areas are dangerous due to undetonated cluster munitions, remote deployed mines and other UXO.
- The walls of the destroyed urban area provided shelter from radioactive dust from upwind (unlikely).
- Outside the urban area is too open, and marauders use sniper rifles on visible individuals.
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