Farmers transplant rice seedlings in the field at Shuangmiao Village of Baofeng Township in Zhushan County, central China's Hubei Province, May 5, 2013. Farmers in central and eastern China are busy with planting crops as the summer approaches. (Xinhua/Zhang Lei)

Farmers transplant rice seedlings in the field at Shuangmiao Village of Baofeng Township in Zhushan County, central China's Hubei Province, May 5, 2013. Farmers in central and eastern China are busy with planting crops as the summer approaches. (Xinhua/Zhang Lei)

Farmers take care of peanut seedlings covered with mulches in the field in Yangzhuang Village of Zaozhuang City, east China's Shandong Province, May 5, 2013. Farmers in central and eastern China are busy with planting crops as the summer approaches. (Xinhua/Liu Mingxiang)

Farmers take care of peanut seedlings covered with mulches in the field in Yangzhuang Village of Zaozhuang City, east China's Shandong Province, May 5, 2013. Farmers in central and eastern China are busy with planting crops as the summer approaches. (Xinhua/Liu Mingxiang)

A farmer takes care of peanut seedlings covered with mulches in the field at Yangzhuang Village of Zaozhuang City, east China's Shandong Province, May 5, 2013. Farmers in central and eastern China are busy with planting crops as the summer approaches. (Xinhua/Liu Mingxiang)

Farmers take care of peanut seedlings covered with mulches in the field in Yangzhuang Village of Zaozhuang City, east China's Shandong Province, May 5, 2013. Farmers in central and eastern China are busy with planting crops as the summer approaches. (Xinhua/Liu Mingxiang)

Farmers transplant rice seedlings in the field at Shuangmiao Village of Baofeng Township in Zhushan County, central China's Hubei Province, May 5, 2013. Farmers in central and eastern China are busy with planting crops as the summer approaches. (Xinhua/Zhang Lei)