Using Hydroponics for Food Production
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- Regina Whitehead
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1 Using Hydroponics for Food Production
2 History of Hydroponics Hanging gardens of Babylon Aztec floating gardens World War II-hydroponics in western Pacific Plastics changed everything! Boom in 1990 s Space program Growing in deserts Vertical farming Large scale production
3 Advantages Crops can be grown where soil is unsuitable Reduced plant disease More control Bigger yields Disadvantages Initial costs higher Deeper knowledge is needed If introduced, diseases can easily spread Needs more attention
4 The basics Growing substrates Nutrient solution System designs
5 Growing Substrates What makes a good media? Provides support Good pore size Does not clog system Does not affect nutrient solution Photo: /
6 Growing Substrates Pea Gravel Coarse Sand Sawdust Perlite Vermiculite Peat moss Rockwool Expanded clay pellets Coconut fiber Growstones Oasis cubes
7 Rockwool Widely used High-water holding capacity Good aeration Needs a pre-soak to lower ph Irritant when dry Not recyclable, not reusable Photo: grodan101.com
8 Expanded Clay Hydroton/Grow Rocks Can be reused (wash and sterlize) Inert Free-draining May get too dry for ebb & flow systems Not good for starting seed Photo: /
9 Coconut Fibers (Coir) Many different sizes Good water holding capacity Different grades Salt concern? Photo:
10 Grow Stones 99% recycled glass Similar to lava rock Not good for starting seeds Not compostable, reusable with sterilization Photo:
11 Oasis Horticubes Similar to florist foam Non-reactive in nutrient solution Can crumble Not compostable, not reusable Good for seed starting Photo:
12 Rapid Rooters Tree bark/compost based Some crumbling Good for seed starting Usually need additional support Photo: bestbudsgreenhousesupplies.com
13 Not recommended Jiffy Pots pellets Peat based Can break down and clog up system Transplants from soilless mediums Disease concerns Organic matter in tank Photo:
14 Photos: onpointhydroponics.com
15 Nutrient Solutions 1. Make your own 2. Conventional solutions Liquid or powder 3. Organic solutions Aquaponics Compost tea Premixed solutions Photos:
16 Base Nutrients Macro Nutrients Nitrogen - (N) is primary to foliage plant growth. Phosphorus - (P) Phosphorus helps build strong roots and is vital for flower and seed production. Potassium (K) - Potassium increases chlorophyll in foliage and helps regulate stomata openings so plants make better use of light and air Secondary Nutrients Magnesium (Mg), Calcium (Ca) Trace Elements Sulphur (S), Iron (Fe), Manganese (Mg), Zinc (Z), Copper (C), Boron (B), Molybdenum (Mn)
17 Options, options, options!!! Some solutions are complete Some are two part (Ca & Mg separate) Some require additional purchase of micronutrients Formulas for vegetative growth, flowering, and fruiting. Depends on what you re growing Check labels Usually can t premix
18 Additives Mycorrhizal fungi Carbohydrates Single nutrient solutions (K alone) Flower boosters Silicates Root healers Flushes/clearing solutions
19 Types of Systems Basic wick Non-circulating raft system or deep water Top feed/drip NFT (nutrient film technique) Ebb and Flow Aeroponics Aquaponics
20 Very basic Basic Wick Self-watering Many options: from pop bottles to 5 gallon buckets and beyond
21 The EarthTainer tm Instructions online
22 Raft Systems Photo: Geoff Wilson, Aquaponics Network Australia
23 Small-scale raft culture Photo: urbangardenmagazine.com
24 Top Feed/Drip Systems Rings or standard emitters Pumps nutrients to top of pot Photo:
25 Top Feed/Drip System Photo:
26 NFT (Nutrient Film Technique) Figure:
27 Photo: Crop King
28 Photo: Crop King
29 Ebb and Flow Photos:
30 Ebb and Flow Photo:
31 Vertical growing Photo:
32 Aeroponics Photo:
33 Managing the nutrient solution ph EC Oxygen Temperature
34 ph Measure of how acidic or basic the nutrient solution is 0 (acidic) to 14 (basic) Most plants prefer Can change over time Affects nutrient uptake
35 Managing ph Check daily-especially when first setting up or changing nutrients Photo: www. vpmt.com
36 What is EC? EC=Electrical Conductivity General idea of soluble salts Can t tell you the individual N-P-K Always check the unit being measured Photo:
37 What about TDS and PPM? TDS=Total Dissolved Solids PPM= Parts Per Million Difficult to convert to EC Fallen out of favor
38 Dissolved Oxygen Very important! Use aquarium bubbler for nonrecirculating system Use high density airstone Photo:
39 Temperature Optimum depends on crop Check air and nutrient solution temperature Water chillers and heaters can be used
40 What about light? Natural Light: Greenhouse Artificial Light: Supplemental lighting
41 Supplemental Lights Fluorescent (T5 most efficient) shop lights, low cost High-pressure sodium Best for flowering, $$$ Metal halide Best all-around/vegetative, $$$ LED Low energy use, research?
42 Carbon Dioxide Enrichment? Commercial growers Increases yields by 20% Natural gas $$$ Photo:
43 What beginners don t need Odor control systems Grow cabinets Cloning system Plant stimulants, additives, bud boosters, etc Light rails/tracks Keep it simple!
44 Many options: When do I replace the nutrient solution? Top off with plain water or nutrient solution Full replacement depends on the crop: 7-10 days if high use/fruiting crop 2+ months if low use (lettuce or herbs)
45 Waste Nutrient Solution? The problem: High nitrates & phosphates Avoid runoff to surface water! Options: Send down sewer to waste water treatment plant Apply to houseplants and garden plots Commercial operations Recycle water Constructed wetland remediation system
46 What can you grow?
47 Lettuce Photo:
48 Lettuce Good for beginners days to maturitydepending on variety Sequential plantings to ensure continuous supply Photo: images.plant-care.com
49 Lettuce Varieties Bibb: Deci-minor, Ostinata, Cortina, Rex, Salina, Milou, Vegas, Cortina Looseleaf: Domineer, Black Seeded Simpson, Grand Rapids, Waldmann s Dark Green Head/Iceberg: Great Lakes 659, Montemar Romaine: Valmaine Cos, Cimmaron, Parris Island Cos (From: Hydroponic Food Production, H.M. Resh)
50 Tomatoes Pollination required Indeterminates can produce for months Trellising required
51 Tomato Varieties Beefsteak: Dombito, Caruso, Larma, Perfecto, Belmondo, Trend, Trust, Apollo, Match, Blitz, Quest, Laura Cherry: Favorita, Conchita TOV (tomato on the vine): Tradiro, Ambiance, Balance, Cronos (From: Hydroponic Food Production, H.M. Resh)
52 Cucumbers European/English Doesn t require pollination Trellising required Photo: grodan.com
53 European Cucumber Varieties Varieties: Toska 70, Pandex, Uniflora D, Corona, Farona, Marillo, Fidelio, Bronco, Mustang, Exacta, Ventura 1289, Jessica, Optima, Flamingo, Dominica, Accolade, Discover, Milligon (From: Hydroponic Food Production, H.M. Resh)
54 Bell Peppers Trellising required Can be difficult to grow and manage nutrient solution 20+ peppers off single plant Photo: grodans.com
55 Bell Pepper Varieties Red: Delphin, Plutona, Tango, Cubico, Mazurka, Val Valeta Yellow: Luteus, Goldstar, Samantha, Gold Flame, Kelvin Orange: Wonder, Eagle, Narobi, Fellini Purple: Violetta (From: Hydroponic Food Production, H.M. Resh)
56 Basil Easy to grow All varieties do well Pinch back to encourage branching Will last many months Photo: green-change.com
57 Other plants Oregano Thyme Mint Strawberries Watercress Easy to grow Photo:
58 Desktop Hydroponics Raft System: Handout from Urban Garden Magazine Cooler setup on display Start with lettuce, basil or other vegetative crop Photo: urbangardenmagazine.com
59 April 30th
60 May 17th
61 Inputs/Outputs Transplants/seed* Nutrient solution* ph up/down * Coconut coir* Cooler Tubing Airstone & pump Garbage bag Duct tape Lights Harvest as of July 8 th 7 clamshells of basil from two plants $28 value Will add two additional plants to system
62 7 harvests in ~2.5 months! July 8th
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