This, however, results in an indoor climate which significantly differs from that in conventional greenhouses: At high solar radiation intensity, temperature and relative humidity of the air within the greenhouse are kept very high in order to extract and store as much thermal energy as possible while in periods with low solar radiation, the stored thermal energy for greenhouse heating is limited. Therefore, in Grossbeeren, we investigate how much we can alter micrometeorological conditions but still allow plant growth without negative effects on yield and quality. The restrictions that we find will serve as important guidelines for the operation of low-energy greenhouses. Based on the possibilities of the closed operation mode such as high CO2-concentrations and constraints such as extremely low and high temperatures, specific control strategies for climate, irrigation and fertilization will be developed and tested.
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