Hydroponics Powerpoint
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Transcript of Hydroponics Powerpoint
Hydroponics
Objective: Introduce students to growing plants in nutrient solutions
What is hydroponics? Practice of growing plants in _______
solutions with or without the use of _______ medium to provide mechanical support
Types Liquid systems – no support medium for roots Aggregate systems – have a solid medium of
support: _________, sand, gravel, vermiculite Open - nutrient solution not reused after
delivery to plant roots Closed – surplus solution is recovered,
replenished, and recycled
Hydroponics – pros and cons
Pros Eliminates soil
borne ________ Allows control of
water and nutrients Higher quality
plants with ______ and higher yields
Able to grow vegetables in areas where otherwise is impossible
Cons Management is
_______ High costs if
heating & artificial lights are needed
_______ kcal for 1 kg tomatoes in greenhouse versus 1,865 kcal to ship 5000 km
Equipment expense
The Hanging Gardens of Babylon
The floating Gardensof the Aztecs of Mexico
History of hydroponics Controlled
environment agriculture (CEA) first used for growing ________ under mica in 1st century
Greenhouses & experimental hydroponics appeared in _______ and England during 17th century
History of hydroponics US 1925-1935
New Jersey Agricultural Experiment Station improved sand culture method
California Agricultural Experiment Station used _______ and sand culture methods for large scale production
__________& Arnon develop complete nutrient solution
History of hydroponics Some use of
hydroponics on _________ Islands during World War II
______ popularized nutriculture (hydroponics) in the post-war period
History of hydroponics High energy costs
in early 1970’s caused widespread ___________
Late 1960’s: nutrient _______ technique developed
Types of hydroponic systems Ebb and flow systems Continuous drip systems __________ systems Nutrient film systems ______ systems Water culture
Ebb and flow systems
Floods growth tray with nutrient solution
Drains solution into reservoir
Pump and timer failures can dry out ______
Uses medium such as _________ or rock wool to retain water
Continuous drip systems Most popular Nutrient solution
dripped out to based of plant
Aeroponic systems Nutrient solution
sprayed onto roots in ______ chambers where roots are suspended in _____
Used at Epcot Center at Disney World
Nutrient film systems
Constant flow of nutrient solution through growing tray
Solution ________ Roots are inside
bag and hang in air when no solution recycled
Wick systems Simplest design Nutrient solution
drawn into growing area through _____
Large plants use nutrient solution faster than wick can provide
Water culture systems
Plants grow on platform with roots suspended into solution
_______ bubbled into nutrient solution to provide oxygen for roots
Does not work well with _____ plants or long-term growing
Growing vegetables and herbs Vegetables
Common – lettuce, _______, cucumber Rapid growing, good taste, high yield Tomato sometimes lack _______ Why?
Herbs Common – basil, sage, ________, mint Lack smell and taste