Crop gross weight mapping is a weighing system, which is based on an electronic belt scale. The system records yield differences within the field and documents the crop yields on a site-specific basis. Based on this data, a yield map can be created that visualizes zones of high and low yield. With the help of a Farm Management Information System (FMIS), a map for the site-specific application of i.e. fertilizer, pesticides or seed can be derived from this yield map. All measured values can be stored in ISO-XML format and transmitted using a USB stick or the manufacturer-independent data exchange platform "agrirouter".