A farmer maintains a greenhouse in Hongze District of Huai'an City, east China's Jiangsu Province, Feb. 17, 2019. (Photos: Xinhua)

Farmers work in the field in Jiaji Town of Qionghai City, south China's Hainan Province, Feb. 17, 2019.

Aerial photo taken on Feb. 17, 2019 shows farmers planting radish in Pingyi County of Linyi City, east China's Shandong Province.

Aerial photo taken on Feb. 17, 2019 shows farmers planting radish in Pingyi County of Linyi City, east China's Shandong Province.

A farmer walks in the field in Rongjiang County of Qiandongnan Miao and Dong Autonomous Prefecture, southwest China's Guizhou Province, Feb. 17, 2019.

Aerial photo taken on Feb. 17, 2019 shows farmers arranging grape trellis in Zigui County of Yichang City, central China's Hubei Province.