hand the market price fluctuations and the environment rules to improve the water-use efficiency or reduce the fertilizer residues in the soil such as the nitrate contents are other aspects to be taken into account Therefore the optimal production process in a greenhouse agrosystem may be summarized as the problem to reaching the following objectives an optimal crop growth a bigger production with a better quality reduction of the associate costs mainly fuel electricity and fertilizers reduction of residues mainly pesticides and ions in soil and the improvement of the water use efficiency Many approaches have already been applied to this problem for instance dealing with the management of greenhouse climate in the optimal control field eg Challa and van 2 MO optimization in crop production
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