Recently a mechanical sensor pendulum-meter was developed for meas- uring the crop biomass density in cereal fields. It has a working width of 1 m and is central mounted in front of a tractor. The sensor has finished the stage of research and development and is now market available un- der the name "Crop-meter". To investigate the agronomic potential of the Crop-meter, the sensor was combined with a centrifugal spreader and a field sprayer for the variable rate application of nitrogen fertilizer, growth regulators and fungicides in real time. Based on farm scale strip trials, the effects regarding savings and yield response the new sensor was positive assessed.
