Question

What two factors make the operation of greenhouses considerably expensive ?

Answer 1

Answer:

Heating and ventilation are two main activities in a successful greenhouse. There has to be regular supply of fresh air for plant respiration. All these are artificially done and account forconsiderable cost of operating agreenhouse.

Answer 2

Explanation: The Four Factors of Greenhouse Environmental Control. As any scientist will tell you, a growing environment is more than just the temperature of the air outside.

Heating and ventilation are two main activities in a successful greenhouse. There has to be regular supply of fresh air for plant respiration. All these are artificially done and account for considerable cost of operating a greenhouse.