Greenhouse system is a complex system which contains multi-input, multi-output, strong coupling and so on. The intensity of light in greenhouses, soil (e.g. temperature and humidity, soil conditions), air (e.g. temperature and humidity, carbon dioxide, oxygen, etc.) and other biological conditions affect crop growth and development. These are time variables, and they have no rules to follow, and these variables are interactive, mutual influence, difficult to express in mathematical models, this series of problems have brought great difficulty to greenhouse control. One of the biggest effects on greenhouse plant growth is the change in temperature and humidity, at present, most of the research focuses on temperature and humidity control.
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