25 years of Yara's N-Sensor: A legacy in precision agriculture

Advancing precision agriculture

The N-Sensor's journey began with a collaboration between Yara and Dr. Stefan Reusch, whose Ph.D. research on crop canopy sensing laid the foundation for this transformative technology.

Designed to measure nitrogen uptake variability in real time, the tractor-mounted N-Sensor provides farmers with actionable data to refine fertilizer applications. This not only boosts productivity but also reduces the environmental impact of farming.

“The N-Sensor has become one of the most recognized precision farming tools. For over two decades, it has maintained its position as a leader in site-specific crop management, inspiring new remote sensing technologies and serving as a blueprint for the fusion of technology and agronomy."

Dr. Stefan Reusch, R&D Lead - Sensing Tool Development at Yara Agronomy and Research and Development

A legacy of innovation

Over its 25-year history, the N-Sensor has undergone five generations of evolution. From its early days as a passive, daylight-dependent system, it has matured into an advanced, active sensor capable of reliable operation both day and night.

Through continuous software updates, the N-Sensor’s functionality has expanded significantly, including: support for a wider range of crops, enhanced calibration accuracy and compatibility with diverse spreaders and sprayers.

“Today, the N-Sensor is versatile and adaptable to a variety of crops, including small grains, maize, oilseed rape, grassland, sugarcane, and potatoes, among others,” explains Dr. Stefan Reusch.

Delivering tangible benefits 

The N-Sensor delivers measurable advantages by using Variable Rate Application (VRA) technology to fine-tune nitrogen applications. Farmers using the sensor have achieved: up to a 12% increase in yields, up to a 18.5% increase in combine output, and a 14% reduction in fertilizer usage.

By minimizing over- and under-application and reducing field variability, the N-Sensor not only enhances harvest quality but also lowers input costs and environmental impact.

A global footprint

With over 2,700 units sold across more than 30 countries, the N-Sensor has established a truly global impact. Its advanced features, including optimized spectral indices and crop-specific calibrations, set it apart as a trusted tool for precision farming worldwide.

The future of precision agriculture 

Looking to the future, Dr. Stefan Reusch envisions even greater possibilities for the N-Sensor:  "There's significant opportunity - and necessity - to combine N-Sensor data with other vital information sources like soil properties, weather patterns, and satellite imagery. Whether driven by AI or traditional approaches, the potential for a smarter, interconnected agricultural ecosystem is within reach."

As we celebrate 25 years of innovation, the N-Sensor stands as a testament to how science and technology are central to transforming food production and driving more sustainable and efficient food systems.