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Hydroponics. Phyllis Putnam Jean Johnston Jessica Garner. Introduction. -- From Greek - Hydro = water and pronos = labor -- First users of hydroponics -- Earliest book, Sylva Sylarum: Or a Natural History of Francis Bacon, 1627  .

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hydroponics

Hydroponics

Phyllis Putnam

Jean Johnston

Jessica Garner

introduction
Introduction
  • -- From Greek - Hydro = water and pronos = labor
  • -- First users of hydroponics
  • -- Earliest book, Sylva Sylarum: Or a Natural History of Francis Bacon, 1627  
slide3

-- German scientists develop the first nutrient formula, 1929

  • -- World War II successful hydroponic operation
  • -- 1970s and 80s and on to Mars
advantages
Advantages
  • Ability to grow vegetables year round
  • Grow plants in smaller spaces (apt, balcony)
  • Sterile Medium - No weeds, No soil-borne pests
  • Healthy Plants - All necessary growth elements readily available in solution
  • Plants mature faster (earlier crop)
  • Smaller root system (smaller spaces again) - Roots don’t have to spread out to reach food
slide5

Ability to automate system with a timer - Reduces time, Gardener can be gone for long periods of time

  • Eliminates need for vast farmland
  • Can raise crops in desert sands - Water is reused, Less water is used
  • Lettuce is cleaner (no soil on leaves)
  • No tillage
  • Plants often larger and healthier
disadvantages
Disadvantages
  • Cost: Expensive to set up system (fixtures, water pumps, etc)
  • Nutrient solution must be kept at original volume - Water evaporates; add water, Solution can become toxic if too much nitrates (low light)
  • Use beneficial predators to control insects
  • Water quality can be a problem, poor plant growth - Excessive alkalinity or salt, Softened water, too much sodium
  • Roots need oxygen - Need a bubbler or continuous flow
  • Plants need to be supported (no soil to support)
  • Cost too high for most commercial growers (grow expensive crops)
types of hydroponic systems
Types of Hydroponic Systems
  • Aquaculture
  • Aggregate
  • Aeroponics
  • Continuous Flow
aquaculture aquaponics
Aquaculture/Aquaponics
  • Easiest set-up
  • Roots totally immersed in nutrient solution
  • Must: Support plant above solution, aerate solution and prevent light from reaching solution
  • Change solution every 1-2 weeks
continuous flow system
Continuous Flow System
  • Typically used in commercial hydroponics
  • Nutrient solution pumped or flowed by gravity to growing pipes
  • Bathes the roots then returns to holding tank
  • Solution aerates itself as it flows back
  • PVC pipe is commonly used.
aeroponics
Aeroponics
  • Roots of the plant grow in a closed container
  • Misting system of nutrient solution
  • Near 100% humidity to prevent drying
  • A-Frame containers are most popular
aggregate culture
Aggregate Culture
  • Uses some form of inert material (i.e. sand) to support plant roots
  • Pump and return solution using 1 of 2 methods
  • Flood and drain method
  • Trickle feed method