Hampshire and Isle of Wight Constabulary are appealing for information following a collision involving a motorbike and a tractor in Adgestone.
Police were called shortly after 7pm following reports of a collision on Lower Road.
Officers confirmed that the crash involved a Yamaha R125 and a tractor, which was towing a trailer.
The rider of the motorcycle, a man in his 40s, was taken to Southampton General Hospital with serious injuries.
A police spokesperson said: "Were you in the area at the time of the incident? Did you witness the collision, or were you driving by with a dashcam fitted to your vehicle?
"If you have any information, please contact us online or on 101, quoting 44240358148."
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