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This research was conducted to develop a silage yield mapping system using DGPS, load cells, Bluetooth modules for wireless data transmission, and a moisture sensor. A silage yield mapping system was successfully developed and tested in a silage corn field. The system yielded an error in the range of 0.37 ~ 1.96% of total harvested crop, compared with measurements by a platform scale. A Bluetooth module (wireless transmission) was successfully implemented to transfer moisture sensor information to a host computer. A silage corn yield map was created for a site-specific crop management.