Hydroponics Powerpoint

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Hydroponics Objective: Introduce students to growing plants in nutrient solutions

description

Farming

Transcript of Hydroponics Powerpoint

Page 1: Hydroponics Powerpoint

Hydroponics

Objective: Introduce students to growing plants in nutrient solutions

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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

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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

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The Hanging Gardens of Babylon

The floating Gardensof the Aztecs of Mexico

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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

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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

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History of hydroponics Some use of

hydroponics on _________ Islands during World War II

______ popularized nutriculture (hydroponics) in the post-war period

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History of hydroponics High energy costs

in early 1970’s caused widespread ___________

Late 1960’s: nutrient _______ technique developed

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Types of hydroponic systems Ebb and flow systems Continuous drip systems __________ systems Nutrient film systems ______ systems Water culture

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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

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Continuous drip systems Most popular Nutrient solution

dripped out to based of plant

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Aeroponic systems Nutrient solution

sprayed onto roots in ______ chambers where roots are suspended in _____

Used at Epcot Center at Disney World

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Nutrient film systems

Constant flow of nutrient solution through growing tray

Solution ________ Roots are inside

bag and hang in air when no solution recycled

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Wick systems Simplest design Nutrient solution

drawn into growing area through _____

Large plants use nutrient solution faster than wick can provide

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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

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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