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Hydroponics NUTRIENT FILM TECHNIQUE (NFT)
Eric Cook
907-‐460-‐1316
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Elements of Hydroponic Systems u Water Delivery System
u Nutrient Injection System
u Media – Something to hold the roots
u Irrigation Catchment
http://hydroponicssystems.co/wp-content/uploads/2011/01/NFT-hydroponics-systems.png
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Nutrient Film Technique (NFT)
u The water is pumped from a main tank and distributed
u Continuous flow of nutrient solution to roots
u The water gravity drains back to the tank
u Continuously recycled nutrient solution
http://www.simplyhydro.com/images/content/nft.gif
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Nutrient Film Technique (NFT) – Water Delivery System u Holding Tank with aeration and heating or
cooling – control root zone temp
u Automatic Fill/ Float Valve
u Pump
u Filters and Clean outs
u Distribution Lines
u Emitters(6 gph is good) with small hoses
u Tray to hold plants
u Frame to hold trays – angled for flow
u Drain pipes
u Flows back to your Tank http://www.hydroworld.co.za/index_htm_files/78.jpg
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Example NFT System 5
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Cooling, Heating and Aeration 6
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Float Valve – for constant tank fill 7
http://ecx.images-amazon.com/images/I/61PPkLu-abL._SY355_.jpg
http://www.leaderproducts.com.au/images/119.jpg
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External Pump or Submersible Pump 8
http://ecx.imagesamazon.com/images/I/619jnFYOkdL._SL1200_.jpg
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Screen or Disk Filters 9
http://i.ebayimg.com/00/s/NjAwWDYwMA==/z/U~gAAMXQhpdRnpBp/$T2eC16N,!zoE9s5nd9!DBRnpBoK!t!~~60_35.JPG
http://www.netafimusa.com/files/images/landscape/manual-filters/manual-filter-mode.jpg
http://www.dripirrigation.com/system/pgphotos/130/tdsphoto/Drip-irrigation-filter.gif?1299720240
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Distribution Lines, 6gph Emitter 10
https://www.cropking.com/sites/default/files/styles/340x340/public/EMI1001.png?itok=9NyrJCH-
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Growing Trays 11
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Trays Spaced 16” apart on center, alternating hole positions
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Seedling grown for 15 -25 days before being put on the system
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Drain Pipes 14
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Nutrient Film Technique (NFT) – Fertilizer Delivery System u Stock Tanks
u Nutrient Solutions
u Acid or Base for pH Adjustment
u Injection or Dosing System
u Controller
u Monitoring probes for EC and pH
http://www.hidhut.com/images/minifertigator.jpg
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Three Stock Tanks (Acid is behind in the picture)
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Fertilizer: Tank 1 - everything without nitrogen
Lettuce Formula Magnesium Sulfate
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Fertilizer: Tank 2 – Calcium Nitrate & Potassium Nitrate
Calcium Nitrate Potassium Nitrate
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Small Pump to Mix the Concentrated Nutrient Solution Tanks
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What can you use to adjust pH?
u Diluted Sulfuric Acid - Battery Acid – lower pH
u pH Down - Phosphoric Acid – lower pH
u PH Up - Potassium Hydroxide & Potassium Carbonate – raise pH
u Potassium Phosphate – raise pH
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http://www.powergrowsystems.com/media/catalog/product/cache/1/image/650x650/9df78eab33525d08d6e5fb8d27136e95/g/e/general_hydroponics_phkit.jpg
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Peristaltic Pump Dispenser – Injects Stock Solution
http://californiawarewashinglaundryservice.com/resources/_wsb_508x348_OPP.jpg
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Peristaltic Triple Pump
u Two Pumps for fertilizer
u Third Pump injects acid or base
http://www.ehydroponics.com/upload/product/large/2522-american-hydroponics-peristaltic-triple-pump-id-amp-nd1.jpg
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Controller
u If you don’t have a automatic Controller, then you are the controller.
u Directs Dosing when pH or EC of out of range
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Temperature, pH, EC Probes
http://agrowtek.com/images/content/GC-Pro_Hydro_main.jpg
http://www.hannainst.com/images/imgHI_1285-5_lg.jpg
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Nutrient Film Technique – Media - Desirable and essential characteristics u Holds the Roots
u Doesn’t brake apart and clog the system
u Sterile – clean and sanitary
u Neutral – doesn’t give or take nutrients or change pH
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Nutrient Film Technique - Media Options u Rockwool
u Sure to Grow
u Oasis
u Expanded clay pellets in baskets
u Gravel in Baskets
u Anything big enough to not clog the system and inert
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Rockwool 27
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Sure to Grow 28
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Oasis 29
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What Can You Grow?
u Lettuce
u Sweet Basil
u Thai Basil
u Water Cress
u Other Salad Greens, Mustards
u Spinach – under short day – sporadic, more difficult
u Others
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http://www.floressencetea.com/mm5/graphics/Articles/Watercress.jpg
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Variety Selection: Lettuce
Summer
u Tip Burn resistant – non-central head forming varieties
u Full Sized Varieties – mini’s seem to tip burn more often u Oak Leaf u Great Green Rapids u Lollo u Summer Crisp – Teide and Muir u Salanova Incised u Salanova Sweet Crisp
Winter
u Low light performance
u Compact, but fast growing
u Lollo
u Romaine
u Summer Crisp
u Multileaf u Butterhead
u Salanova Sweet Crip
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Winter and Summer Lettuce Varieties u In a Nutshell: u Central head forming varieties are more likely to tip burn than loose
leaf varieties. u Full sized varieties are less likely to tip burn and Mini or Baby
varieties. u Fast growing Great Green Rapids and Oakleaf get lanky in the
winter under low light.
u Varieties that tip burn or bolt the least under high temperature and long day conditions and have good production are recommended for the summer.
u Varieties that bulk up well with good yields and compact, non-
floppy form are recommended for the winter.
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Winter, Fall, Spring (Seed Dates: Aug 1 to Mar 15) Varieties for best yield and quality in low light situations Best u Green Lollo Livigna
u Green Multileaf Multy
u Red Summercrisp Teide*
u Red Summercrisp Cherokee
u Green Summercrisp Nevada
u Romaine Coastal Star
u Romaine Green Forest
Good
u Red Lollo Revolution(doesn’t bulk up the best at times)
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Summer (Seed Dates: Mar 15 -Aug 1) Varieties for long days and high temperatures Best u Great Green Rapids Tropicana* u Great Green Rapids Two Star u Great Green Rapids Green Star u Red Oakleaf Roxai* u Red Oakleaf Oscarde
u Green Oakleaf Panisse* Good u Red Summercrisp Teide (some tipburn at times) u Red Summercrisp Cherokee (some tipburn at times)
u Green Lollo Livigna u Red Lollo Revolution (some tipburn at times) u Romaine Coastal Star*(some tipburn at times) u Romaine Green Forest (some tipburn at times)
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Oakleaf 35
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Romaine and Summer Crisp
u Romaine – Costal Star, Green Forest
u Summer Crisp – Cherokee, Nevada
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Sweet Basil 37
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Thai Basil 38
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Thanks for coming! 39