Advances in Industrial Control Modern agriculture is nowadays subject to regulations in terms of quality and environmental impact and thus it is a field where the application of automatic control techniques has increased during the last few years. The greenhouse production agrosystem is a complex of physical, chemical, and biological processes, taking place simultaneously, reacting with different response times and patterns to environmental factors, and characterized by many interactions, which must be controlled to obtain the best results for the grower. Crop growth is the most important process and is mainly influenced by surrounding environmental climatic variables (Photosynthetically Active Radiation—PAR, temperature, humidity, and CO2 concentration of the inside air), the amount of water and fertilizers supplied by irrigation, pests and diseases, and culture labors such as pruning and pesticide treatments, among others.