hydroponics - purdue university · hydroponics is the art of growing plants without soil, but in...
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Hydroponics
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Hydroponic lettuce production:https://www.youtube.com/watch?v=6kUm_I7bLYw
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Hydroponics is the art of growing plants without soil, but in water enriched with nutrients and oxygen
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Many hydroponic techniques exist
1.Continuous flow nutrient film technique
2.Deep water hydroponic buckets/tubs
3.Ebb & Flow or Flood & Drain sub-irrigation
4.Aeroponics
5. Floating systems
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Nutrient film technique (NFT) is a hydroponic technique wherein a very shallow stream of water containing all the dissolved nutrients required for plant growth is re-circulated past the roots of plants in a watertight gully, also known as channels.
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Fertilizer solution
1 ‘ Gully or channel
Thin nutrient film
• Roots receive oxygen, water and nutrients• Water and nutrients recirculated
Nutrient Film Technique Explained
Flow= 1 L/min
• What about diseases?• What about power outages?• What about water temperature in pipes?• Tomatoes, peppers and other big plants?
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BubblerNutrient solution
Deep water culture
• Suitable for big size plants• Better water temperature control• Home hydroponics
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Fertilizer solution
Flood and drain system : Flood stage
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Fertilizer solution
Flood and drain system : Drain stage
• Soilless media is used in containers• Water is not supplied continuously• Usually 50% less fertilizer concentration is used
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Aeroponics
• Good supply of oxygen• Disease free systems• Good for research on root
morphology• Requires sophisticated mist
systems
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Floating systems: https://www.youtube.com/watch?v=f4Y9X7ye7i8