Story:Nigeria's soil-free salad farm: How one young entrepreneur is growing greens in shipping containers - no soil needed.

Hydroponics is a subset of hydroculture, which is the growing of plants in a soil less medium, or an aquatic based environment. Hydroponic growing uses mineral nutrient solutions to feed the plants in water, without soil. See a video of how a young entrepreneur in Nigeria is using this technolgy here:  http://www.bbc.com/news/av/stories-43004630/nigeria-s-soil-free-salad-farm