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Best Practices in Hydroponics and Sustainable Greenhouse Production
David Specca Assistant Director for Controlled Environment Agriculture
Rutgers EcoComplex
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Outline
• Review of Current Best Practices for Hydroponic Systems
• Snapshot of NJ’s Greenhouse Industry • Review of EcoComplex’s Sustainable Greenhouse
Activities
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Hydroponics may be defined as the science of growing plants in soilless, inert media, to which is added a water soluble nutrient solution that contains all the essential elements needed by the plant for optimum growth and development.
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Advantages of Hydroponics • Can be utilized on most sites regardless of whether there is
poor soil, contaminated soil or no soil at all (e.g. sites with marginal soil, rocky soil, brownfields, pavement or rooftop)
• Quick setup time, modular, lightweight and easy to relocate • Lower startup costs than imported soil beds • Adaptable to many types of crops and climates • High yielding • Water efficient – up to 90% reduction in water use vs outdoor
field production • Can be installed at a comfortable work height • Can reduce labor inputs if designed properly • Clean and sanitary
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Common Types of Hydroponic Systems
• Solid Media Based Systems – These systems use inert materials such as rockwool, perlite, oasis block, coconut coir, sawdust, gravel or sand – Blocks and slabs – Loose media
• Water Based Systems – These systems usually start with a solid media seedling block and are transferred to water – Nutrient Film Technique (NFT) – Ebb and Flood – Deep Trough, Raceway, Raft or Floating
• Other Variations – Aeroponics (roots suspended in air) – Aquaponics (aquaculture and hydroponics)
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Tomatoes in Perlite Bags
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Tomatoes in Dutch or Bato Buckets with Perlite Media
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Cucumbers in Rockwool Slabs
Photo by Neil Mattson, Cornell University
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Orchids in Peatmoss
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Peppers growing in Coconut Coir Slabs
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Vertical Garden Displays in Foam
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Ebb and Flood Benches with Rutgers Limited Cluster Tomatoes
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Lettuce in Nutrient Film Technique (NFT) System
Photo by Neil Mattson Cornell Univ.
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NFT Hydroponic Fodder System
http://www.farmtek.com/farm/supplies/prod1;ft_ag_growing_supplies-ft_hydroponic_supplies-ft_fodder_pro_2;pg111628.html
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Cornell Floating Lettuce System
© Cornell University CEA Program
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Aeroponic System Design
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Automated Controls
Photos by Neil Mattson, Cornell University
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Aquaculture Hydroponics + = Aquaponics
Tilapia
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Small-Scale Packaged Aquaponic Tanks
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Aquaponic Plant Production
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NJ Greenhouse Production - Snapshot
• $406 Million/year in revenue for Nursery, Greenhouse, Floriculture and Sod (approximately 50% of this was greenhouse production
• 702 farms (down 10% from 2007) with 36.8 million square feet (844 ac) of production (up 21.5% from 2007 Census).
• Data from 2012 Census of Agriculture
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Sustainable Greenhouse Production
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Co Generation – Heat and Electricity
•Many smaller generation systems can be modified to recover heat making them much more energy efficient, 60-70% vs. 25%
•Biomass feedstocks are well suited for Co-gen applications especially on farms and rural businesses with a large heating demand
•State and Federal incentives may be available to help with equipment costs
•Good LFG clean-up is essential
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Landfill Gas Fired Boiler
• Direct use of Landfill Gas has presented many challenges - need to work with experienced contractors
• Minimal gas cleanup needed as compared to other uses
• Floor-based hot water radiant heating can efficiently use water in the 80 – 120 F range
• Most boilers have dual-fuel capability
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Anaerobic Digester - 500 pound-per-day Food Waste Demonstration at EcoComplex Greenhouse
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Challenges to Producing Low-Carbon, Sustainable Food in Controlled Environment Ag
Economic and Environmental Comparison of Tomatoes Grown Using Conventional and Sustainable Controlled Environment Agriculture and Field Production; He Zang, Serpil Guran, David Specca
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Carbon Emissions Comparison
Energy Related CO2
per acre
Fertilizer & Pesticide Related
CO2 per acre
Structure Related CO2
per acre
Transportation Related CO2
per acre
Yield per acre
(tons)
Total tons CO2/ year/ acre
Tons of CO2 per Ton of
Tomatoes
Conventional Greenhouse
910.4
8.51
3.47
1.48
200
923.7
4.61
Sustainable Greenhouse
96.3
8.51
3.83
1.48
200
110.1
0.55
Field Tomatoes
7.57
(incl./w energy)
0.0
2.0
20 9.57
0.48
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High Tunnel Greenhouse
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RIMOL'S EVERYTHING GREENHOUSE BLOG High Tunnels – To Move or Not to Move?
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Contact Information David Specca
Assistant Director for Controlled Environment Agriculture Rutgers EcoComplex
1200 Florence Columbus Road Bordentown, NJ 08505 609-499-3600 x 4226
Thank You!