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The outflow of inorganic fertilizers from arable land is one of the main sources of surface water pollution. The pollution can be reduced by precise dosing of inorganic fertilizers according to the momentary nutrition need of the cultivated crops. The exact dose of fertilizer can vary considerably from one area to another as the soil conditions can be very variable even in the scope of a single field. The spectral properties of cultivated crops can be used for the calculation of precise doses of fertilizer. In our...