Local villagers drive tractors in a row during a ceremony to mark the start of the spring farming season at Shexing Village, Doilung Deqen County, southwest China's Tibet Autonomous Region, March 15, 2009. (Xinhua/Soinam Norbu) 

Bulls with traditional decorations plow a field during a ceremony to mark the start of the spring farming season at Shexing Village, Doilung Deqen County, southwest China's Tibet Autonomous Region, March 15, 2009. (Xinhua/Soinam Norbu)