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.

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