Greenhouse management

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  • 1. Greenhouse Management
  • 2. Build the Greenhouse to fit your crop!!!
    • Consider:
    • Crop Needs (light, temp, etc.)
    • Size Needs
    • Rafter Strength & Height (baskets)
  • 3. Things to Consider Before Locating a Greenhouse
    • Availability and initial cost of land
    • Availability and cost of water
    • Land characteristics, topography and elevation
    • Availability of labor
    • Proximity to market
    • Check with authorities to determine utilities and zoning regulation
    • Temperature (min/max), wind pattern, slope and exposure
  • 4. Site Your Greenhouse
    • Free of shading from overhangs (i.e. trees)
    • Level Site
      • Slight slope is OK, in order to drain H2O
    • Well Drained Soil
      • Avoid Low Areas w/ Poor Drainage
      • Low areas can form “cold pockets”, increasing heating bills
    • GH should be accessible to vehicles, utilities, and storage areas.
    • Position GH according to crops light needs (see next slide)
  • 5. Position According to Sun
    • Position long side of house facing SW to SE for greatest light exposure to plants
    • For lower light plants, house can face NE to SE or NW to SW
  • 6. How Much Space Do You Need In Your Greenhouse and What Types of Houses Will You Need?
  • 7. Multiple Greenhouses for Staging Plants
    • Warm House
    • Cool House
    • Cold Frame
    • Cloches
    • Shade House
    • Protected & Unprotected Field Area
  • 8. Greenhouse Styles
    • Quonset
    • A-Frame
    • Gothic Arch
    • Gable Roof
    • Dome
    • Slant Side
    Here’s a thinker: Which of these aren’t commercially viable and why?
  • 9. Gutter Connected Houses
  • 10. Foundation
    • Permanent vs. Temporary
  • 11. Framing Materials
    • What are the Pros and Cons?
    • Wood (Cedar and Painted Wood)
    • Aluminum or Galvanized Framing
    • Schedule 80 PVC
  • 12. Choose a Greenhouse Cover
    • Key issues: Cost, Life, and Light
    • Glass
    • Polyethylene Film (UV Resistant)
    • Polycarbonate
      • Single-Layer Structured Panels
      • Double-Layer Structured Panels
      • Triple-Layer Structured Panels
  • 13. Heat Loss Factor for a Small Greenhouse *Heat loss in BTU/hour/square feet/degree F. 1.0 0.8 Double-layer plastic 1.8 1.5 Glass 1.4 1.2* Polyethylene or fiberglass Heat loss (windy area) Heat loss (calm area) Greenhouse covering Table 1. Heat Loss Factor for a Small Hobby Greenhouse
  • 14. Heating the Greenhouse
    • What type of heating system
      • Ambient, overhead infrared, overhead forced air, bottom radiating (“star-fin”)
    • What type of fuel
      • Oil, Natural Gas, Electric, Coal
    • Orientation and location of heaters
      • Root zone heating
      • Overhead foliage heating
    • How is the heat transferred?
    • Is it efficient?
  • 15. Ventilation
    • Forced Air Ventilation System
      • Louvers and fans
      • Degrees of complexity (multipoint, multi-fan systems)
    • Passive air flow through roof vents
    • HAF (Horizontal Airflow Fans)
      • Circulates air around the greenhouse
      • Prevents stagnant air
    Insect Screening to keep bugs out of greenhouse
  • 16. Do You Need To Cool Your GH?
    • Fan/Pad Systems
    • Fog System (Mist)
    • Ventilation
      • Retractable Roof
      • Roll up walls
      • Shading
      • Vents
  • 17. Shade Covers
    • Shade Paint
      • Only works on glass
      • Cheap
      • Not long lasting
      • Difficult to remove
    • Shade Cloth
      • 40%-80%, flexible shading
      • Removable
    • Black out cloth for photoperiodic crops
  • 18. Floors
    • Crushed Rock
      • 5/8 minus
      • Pea gravel
    • Concrete
    • Asphalt
    • Ground Cloth
    • Dirt
    • Combinations
  • 19. Pick a Bench, Any Bench! 
    • Materials:
    • Wood Lattice (Redwood or Spruce)
    • Expanded Metal
    • Other
    • Size:
    • Bench size should fit crop
    • Height. Is it comfortable?
    • Types:
    • Static vs. Rolling Benches
  • 20. Bench Orientation
    • Will the house be open to the public
      • Yes? You better have wide aisles.
      • No? Consider rolling benches to maximize space efficiency
    • Bench Space vs. “Field Area” ratio
    • Do you even need benches?
  • 21. Work and Storage Areas
    • Head house
      • Located on north wall
      • Used for potting, quarantine, storage, tools, packing, shipping/receiving, boiler room.
  • 22. Irrigation
    • How will you keep
    • Your plants watered?
    • Boom Systems
    • Drip
    • Rainbird
    • Flooding Tables
    • Capillary Mats
    • Manual Hoses
    • Buckets
  • 23. Fertilizer Injectors
    • Automatic dosing of concentrate fertilizer
    • Fertilizer Injectors
      • i.e. Dosatron
      • Larger growers
    • Hose-end feeders
      • Smaller growers
  • 24. Propagation Area
    • Will you be propagating plants or just growing them on?
    • What kind of propagation will you do?
    • How much room do you need?
  • 25. Modern GH Innovations
    • Retractable Roof Greenhouses
    • Root-zone Heating
    • Seed Machines
    • Pot/Flat Filling Machines
    • CO2 Generators
    • Sulfur Generators
  • 26. Greenhouse Management
    • Facilities Maintenance & Repair
    • Crop Timing
    • IPM
    • Accounting
    • Accounts Payable
    • Sales
    • Shipping