橡膠
Hainan is a major rubber producer. In the early 20th century Chinese emigrants returning from then British Malaya, introduced rubber trees to the island; after 1950, state farms were developed, and Hainan now produces a substantial amount of China's rubber. Natural rubber is now grown on 246,000 hectares of land. This ranks 6th in the world in harvest area and 5th in terms of output.