4cm.

The root diameter of the seven-year-old Niu Dali is about 4 centimeters, and the yield per tree is about 5 to 10 kilograms, and the yield per mu is about 2,000 kilograms.

One hundred thousand mountain ox Dali is a specialty product of Fangchengang City, Guangxi Zhuang Autonomous Region, and a national geographical indication product of China. On December 29, 2017, the former General Administration of Quality Supervision, Inspection and Quarantine approved the implementation of geographical indication product protection for “Shiwanshan Niu Dali”.