The aim of NitraMon is to develop a sensor concept for online nitrate measurement for agriculture against the background of the ecological challenge of increasing nitrate pollution of soils and groundwater. Given the measurements carried out by the Saxon State Office for the Environment, Agriculture and Geology, according to which large parts of the Free State have groundwater levels above the EU limit value of 50 mg/l nitrate, this problem is particularly acute for Saxony. The focus of the research project is the implementation of a sensor system for the detection of nitrates and the measurement of nitrate concentration. In addition, a self-sufficient sensor network is to be developed, with which it is possible to supply nitrate sensors with ambient energy, e.g. from sunlight or temperature gradients, as well as to continuously collect the sensor data and transmit them wirelessly to a central point for evaluation. With an innovative measurement concept for online measurement, Saxony can play a pioneering role in solving the highly topical problem of nitrate groundwater pollution beyond the borders of the Federal Republic, ensuring Saxony’s role as a high-tech country. The companies involved in the production of nitrate sensors and construction and operation of the sensor network secure and create Saxon jobs in an area of application that is becoming more global in the context of ecological sustainability.