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With the aid of a mechanical sensor in the form of a physical pendulum, the grown plant mass in culmiferous plant cultures can be determined indirectly by means of measuring technology. Through the combination of the sensor with a centrifugal fertilizer spreader and a plant-protection sprayer, technical solutions working in real time were created which resulted in a reduction of 13.5% of the nitrogen fertilizer and 18.7% of the fungicides used under practical conditions.