On the basis of environment control

Master Protected and Precision Horticulture – Notes, Case Studies and Practical Insights – with Rahul

a. Naturally Ventilated Greenhouse

Refers to a greenhouse designed to rely mainly on natural ventilation for temperature and humidity control.
It consists of Roof vents, side openings, and louvered windows that facilitate airflow.
Frame usually made of steel, aluminum, or bamboo; covering can be polythene or shade net.
Example Crops: Leafy vegetables, flowers like chrysanthemum, gerbera, and marigold.
The air flow movement created due to density difference of hot and cold air.
Air exchange rates are very low and much dependent on the temperature difference between internal and external environment.
The open roof has wide anti-rain overlap, protecting crop from inflow of rain.
Additional screen of insect netting on ventilation is provided to prevent insect entry.
Low cost construction and can be constructed by using locally available bamboo, wood and plastic materials.

Advantages:

Limitations:

b. Environmental controlled green house (Artificial ventilated)

Here, environment is either fully controlled or partially controlled by using various tools and heating, cooling units.
The air flow movement is manually created by using fan and pad system or by any other means.
The cost of construction and construction materials is high.
One of its types is Fan and Pad system.

Fan and Pad system

It is the most common type of greenhouse setup for artificial air movement inside green house.

It features include:

Automated fan or manual operated fan cane be used inside these structures.
Thermostat, temperature, sensor, auto on and off can be installed.
The principle of forced-air ventilation is followed in this system which creates air flow through the greenhouse.
Fan either pull fresh air into a greenhouse or exhaust greenhouse air to the outside.