A worker sorts raw cotton collected from local farmers in Qingtou Town, Yongji City of north China's Shanxi Province, Oct. 15, 2012. As one of the largest cotton production areas in north China, Yuncheng has witnessed cotton harvest this year. (Xinhua/Wang Feihang)

A worker sorts raw cotton collected from local farmers in Jinjing Town, Yuncheng City of north China's Shanxi Province, Oct. 15, 2012. As one of the largest cotton production areas in north China, Yuncheng has witnessed cotton harvest this year. (Xinhua/Wang Feihang)

Farmer Guan Erwa picks raw cotton from a field in Jinjing Town, Yuncheng City of north China's Shanxi Province, Oct. 15, 2012. As one of the largest cotton production areas in north China, Yuncheng has witnessed cotton harvest this year. (Xinhua/Wang Feihang)

Farmer Shao Jianping picks raw cotton from a field in Qingtou Town, Yongji City of north China's Shanxi Province, Oct. 15, 2012. As one of the largest cotton production areas in north China, Yuncheng has witnessed cotton harvest this year. (Xinhua/Wang Feihang)