Structural Features

          1.  Frame:

• Made of galvanized steel or aluminum for strength and corrosion resistance.

          2.  Shape:

• Commonly semi-circular (hoop-shaped) or rectangular with a peaked roof.

          3.  Size:

• Ranges from small (6×6 feet) to large commercial sizes (up to several acres).

Covering Material

Polyethylene Film:

• • UV stabilized to prevent degradation from sunlight.
  • Thickness typically between 150-200 microns (6-8 mil).
  • Durable, lasting about 2-5 years depending on conditions.

Ventilation

1. Natural Ventilation:
   • Roll-up side walls.
   • Roof vents.
   • Louvered windows.

          2.  Forced Ventilation:

• Exhaust fans.
• Circulation fans for adequate air movement.

Temperature Control

1. Heating:
   • Electric heaters or gas heaters used in colder climates.

1. Cooling:
   • Shade nets.
   • Evaporative cooling pads.
   • Misting systems.

Humidity Control

1. Misting Systems:
   • Increase humidity for crops requiring high moisture levels.

         2.  Dehumidifiers:

• Reduce excess humidity to prevent fungal diseases.

Lighting

1. Natural Light:
   • Maximized through the transparent polyethylene cover.

         2.  Supplemental Lighting:

• LED grow lights or fluorescent lights for regions with low sunlight.

Watering Systems

1. Drip Irrigation:
   • Efficient water delivery directly to plant roots.

         2.  Sprinkler Systems:

• Used for overhead watering.

Additional Features

1. Benches and Shelves:
   • Organize plants and maximize space.

         2.  Sensors and Controllers:

• Monitor and automate temperature, humidity, and soil moisture.

Advantages

1. Cost-Effective:
   • Cheaper to construct than glass greenhouses.

        2.  Climate Control:

• Provides a controlled environment for year-round cultivation.

        3 .  Versatility:

• Suitable for a variety of crops including vegetables, flowers, and herbs.

        4.  Water Efficiency:

• Drip irrigation reduces water usage.