HugelKulture is raised-bed farming over wood/organic debris 'hills'. The hills retain water, averaging rainfall over time, and provide nutrients to surface crops. Harvest and tending is at easier arm's length. Typically surface plants follow a succession cycle.
It may be that this type of agriculture could be used effectively by nomadic or foraging societies.
Wikipedia Link: https://en.wikipedia.org/wiki/H%C3%BCgelkultur