What is a Green House

• A Green House is a structure covered with a transparent material in which various crops are grown under a system of farming know as Protected Cultivation
• The Structure is also referred as Glass House / Poly House, depending upon the Cladding material used. Under Green House Technology favourable Micro Climatic conditions are created suiting to the crops raised.
• Green House Protect the Plants from adverse climatic conditions such as wind , low temperature, rainfall, excessive radiation, extreme temperature and pests.
• Green House Technology facilitates off –season production of crops to realize higher returns.

Advantages of Greenhouses :

• Ensures multi-fold increase in crop output compared to open cultivation
• Facilitates year round production of selected crops.
• Mitigates impact of adverse climatic conditions in respect of certain type of Green House.
• Facilitates substantial control of pest & diseases .
• Facilitates optimum utilization of all inputs.
• Facilitates raising of off-season production of crops.
• Aids in Nursery Propagation, Hardening of Plants.
• Facilitates High-Tech Cultivation Practices like Hydroponic , Aero-panics and Nutrient Film Techniques.

Greenhouse Type based on Shape

• Lean type greenhouse.
• Even span type greenhouse.
• Uneven span type greenhouse.
• Ridge and furrow type.
• Saw tooth type.
• Quonset greenhouse.
• Interlocking ridges and furrow type Quonset greenhouse.
• Ground to ground greenhouse.

  

1. Green house type

1). Green house type based on Utility

• Greenhouses for active heating.
• Greenhouses for active cooling.

2) Green house type based on construction

• Wooden framed structure.
• Pipe framed structure.
• Truss framed structure.

3). Green house type based on covering material

• Glass glazing.
• Fiber glass reinforced plastic (FRP) glazing 
  i. Plain sheet 
  ii. Corrugated sheet.
• Plastic film 
  i. UV stabilized LDPE film. 
  ii. Silpaulin type sheet

2. Low Cost or Low Tech Greenhouse

• Low cost greenhouse is a simple structure constructed with locally available materials such as bamboo, timber etc.
• The ultra violet ( UV) film is used as cladding to cover the roof and sides.
• Increasing or decreasing the temperature and humidity mostly by opening side walls.
• Suitable for cold climatic zone.
• Suitable for high value vegetable crops during off- Season.

 

3. Medium Tech Green House (Semi- Automated)

• Less expensive compared to High- tech GH.
• Control possible manually/ Semi- automated.
• GI material can be used for frame work.
• Exhaust fans, thermo- stat to control temp.
• Cooling pads/ mist system to control humidity.
• Sun light control by regulating shade nets.
• Need more attention in operations.
• Suitable for Dry & composite climate zones

4. High – Tech Greenhouse (Fully Automated)

• Fully automated controls.
• Less attention in operations.
• Uses computer software for controls.
• More initial cost.
• More suitable to high end applications (Floriculture, Hydroponics/ Aeroponics).
• Requires assured availability of power.

5. Shade net Greenhouses

• Suitable for commercial nurseries / vegetable crops during hot weather .
• It provides protection from excessive sunlight, heat, cold, wind, frost, and hailstorm.
• It also offers protection from insects, birds etc.
• Low Cost of construction