So this is not as much of a gadget as it is an awesome progression in technology.
Dubai-based Agricel have developed a farming system that requires no soil and only a tenth of the water of normal farming.
The film is a sort of hydromembrane which allows the passage of roots, nutrients all the good stuff that plants need. The membrane also hinders pathogens from entering the plants, which is key to healthy agricultural produce.
The idea in itself is useful in parts of the world, where water and hygiene is scarce. This could revolutionize agriculture in third world countries.