Assembly and method for detecting the quantity of plants on a field

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The arrangement has a transmitter (64), which is operated to emit the electromagnetic waves within the visible or infrared wavelength range on a ground covering of a field (80). A receiver (66) is operated to receive waves reflected from the plants (82). An estimation unit (76) is operated to determine elapsed time of the reflected waves of the transmitter to the receiver at different points along a measuring direction. Another transmitter (68) is operated to emit other electromagnetic waves that are reflected from the earth (84) to the significant portion by penetrating the ground covering. An independent claim is included for a method for detecting the quantity of plants in a field.