Takeaways:
- Different soil-less systems exists for growing food including: hydroponics uses sand, peat moss, rice hulls, gravel and drip irrigation. It is the most commonly uses technique.
- Aquaponics uses fish reared in water tanks, and the waste they produce is biofiltered and run through the root zone of the plants.
- Aeroponics is a type of hydroponics system where the water with dissolved nutrients is sprayed at the base of the plants.
