Al-Muhana, Emad Ali Mohamed2022-05-182022-05-1819981959https://drepo.sdl.edu.sa/handle/20.500.14154/3968Greenhouse are constructed and operated to provide an acceptable plant enviroment that will contribute to a profitable enterprise. The dramatic decrease in the ambient, may be considerd as one of the biggest problem in saudi arabia's greenhouse vegetable production industry.enThesis