VRA — Variable Rate Application — is variable rate technology that automatically adjusts the amount of fertiliser spread to the potential of a given field zone. Instead of a uniform rate across the whole field, the spreader increases the rate in high-potential zones and reduces it in weaker zones.
To work in VRA mode you need: an application map (created from yield maps, satellite images or soil samples), a spreader with ISOBUS and section control (e.g. Güstrower GDK with GPS Section Control), and a tractor terminal supporting the ISOXML format.
Benefits: fertiliser savings of 10–20%, more even yields across zones, less nitrogen leaching into groundwater, and better documentation for cross-compliance inspections. For Güstrower spreaders we maintain a spare parts catalogue with assembly drawings.