The crops grown in open field are exposed to vivid environmental - mental conditions, attack of insects and pests, whereas the polyhouse provides a more stable environment
The crops grown in open field are exposed to vivid environ- mental condition, atack of insects and pests, whereas the polyhouse provides a more stable environment. Polyhouse can be divided in yo two types
a) Naturally Ventilated Polyhouse These polyhouse do not have any environmental control system except for the provision of adequate ventilation and fogger system to prevent basically the damage from weather aberrations and other natural agents.
b) Environmental Controlled Polyhouse This type of polyhouse helps to extend the growing season or permits off-season production by way of controlling light, temperature, humidity, carbon-dioxide level and nature of root medium.
