Female tractor driver Qoizong takes part in a spring plowing ceremony in Zetang Coungy of Lkoha Prefecture, southwest China's Tibet Autonomous Region, March 16, 2015. Local farmers celebrated the traditional spring plowing ceremony on March 16, the first day of spring plowing in the lunar Tibetan calendar. The grain output of Tibet has witnessed a growth for five years in a row from 900,000 metric tons (tonnes) in 2009 to 985,000 tonnes in 2014. (Xinhua/Chogo)

Farmers take part in a spring plowing ceremony in Zetang Coungy of Lhoka Prefecture, southwest China's Tibet Autonomous Region, March 16, 2015. Local farmers celebrated the traditional spring plowing ceremony on March 16, the first day of spring plowing in the lunar Tibetan calendar. The grain output of Tibet has witnessed a growth for five year in a growth from 900,000 metric tons (tonnes) in 2009 to 985,000 tonnes in 2014. (Xinhua/Chogo)

A tractor driver waits for ploughing during a spring plowing ceremony in Bomdoi Township in Dagze County, southwest China's Tibet Autonomous Region, March 16, 2015. Local farmers celebrated the traditional spring plowing ceremony on March 16, the first day of spring plowing in the lunar Tibetan calendar. The grain output of Tibet has witnessed a growth for five year in a row from 900,000 metric tons (tonnes) in 2009 to 985,000 tonnes in 2014. (Xinhua/Purbu Zhaxi)

Farmers take part in a spring plowing ceremony in Zetang Coungy of Lhoka Prefecture, southwest China's Tibet Autonomous Region, March 16, 2015. Local farmers celebrated the traditional spring plowing ceremony on March 16, the first day of spring plowing in the lunar Tibetan calendar. The grain output of Tibet has witnessed a growth for five year in a row from 900,000 metric tons (tonnes) in 2009 to 985,000 tonnes in 2014. (Xinhua/Chogo)

A woman casts seeds during a spring plowing ceremony in Bomdoi Township in Dagze County, southwest China's Tibet Autonomous Region, March 16, 2015. Local farmers celebrated the traditional spring plowing ceremony on March 16, the first day of spring plowing in the lunar Tibetan calendar. The grain output of Tibet has witnessed a growth for five year in a row from 900,000 metric tons (tonnes) in 2009 to 985,000 tonnes in 2014. (Xinhua/Purbu Zhaxi)

A tractor driver takes part in ploughing during a spring plowing ceremony in Bomdoi Township in Dagze County, southwest China's Tibet Autonomous Region, March 16, 2015. Local farmers celebrated the traditional spring plowing ceremony on March 16, the first day of spring plowing in the lunar Tibetan calendar. The grain output of Tibet has witnessed a growth for five year in a row from 900,000 metric tons (tonnes) in 2009 to 985,000 tonnes in 2014. (Xinhua/Purbu Zhaxi)

Editor: Lucia Su