The invention relates to a fertilizing system (3) for agricultural soil (2), having a spreading device (4) for spreading fertilizer and having a testing device (5) for detecting a nitrous oxide content in or on the agricultural soil (2) to be fertilized. According to the invention, the testing device (5) has a plurality of nitrous oxide sensors (6), each having a first transmitting device (8) for transmitting measured data, and having a data processing device (9), which has a first receiving device (10) for receiving the measured data.
