Members of a caravan put spring ploughing materials on horses in Ganlu Village of Changtanhe Dong Autonomous Township in Xuan'en County, Central China's Hubei Province, March 10, 2014. More than 30 caravans in Xuan'en County, where most labor choose to migrate to big cities for working, take on tasks to carry spring ploughing materials for the women and the elderly who are stayed at home to take care of the fields. (Xinhua/Li Yiguo)

Horses carry spring ploughing materials for farmers in Ganlu Village of Changtanhe Dong Autonomous Township in Xuan'en County, Central China's Hubei Province, March 10, 2014. More than 30 caravans in Xuan'en County, where most labor choose to migrate to big cities for working, take on tasks to carry spring ploughing materials for the women and the elderly who are stayed at home to take care of the fields. (Xinhua/Li Yiguo)

A horse carries spring ploughing materials for farmers in Ganlu Village of Changtanhe Dong Autonomous Township in Xuan'en County, Central China's Hubei Province, March 10, 2014. More than 30 caravans in Xuan'en County, where most labor choose to migrate to big cities for working, take on tasks to carry spring ploughing materials for the women and the elderly who are stayed at home to take care of the fields. (Xinhua/Li Yiguo)

Horses carry spring ploughing materials for farmers in Ganlu Village of Changtanhe Dong Autonomous Township in Xuan'en County, Central China's Hubei Province, March 10, 2014. More than 30 caravans in Xuan'en County, where most labor choose to migrate to big cities for working, take on tasks to carry spring ploughing materials for the women and the elderly who are stayed at home to take care of the fields. (Xinhua/Li Yiguo)

Horses carry spring ploughing materials for farmers in Ganlu Village of Changtanhe Dong Autonomous Township in Xuan'en County, Central China's Hubei Province, March 10, 2014. More than 30 caravans in Xuan'en County, where most labor choose to migrate to big cities for working, take on tasks to carry spring ploughing materials for the women and the elderly who are stayed at home to take care of the fields. (Xinhua/Li Yiguo)

Horses carry spring ploughing materials for farmers in Ganlu Village of Changtanhe Dong Autonomous Township in Xuan'en County, Central China's Hubei Province, March 10, 2014. More than 30 caravans in Xuan'en County, where most labor choose to migrate to big cities for working, take on tasks to carry spring ploughing materials for the women and the elderly who are stayed at home to take care of the fields. (Xinhua/Li Yiguo)

Horses carry spring ploughing materials for farmers in Ganlu Village of Changtanhe Dong Autonomous Township in Xuan'en County, Central China's Hubei Province, March 10, 2014. More than 30 caravans in Xuan'en County, where most labor choose to migrate to big cities for working, take on tasks to carry spring ploughing materials for the women and the elderly who are stayed at home to take care of the fields. (Xinhua/Li Yiguo)