Farmers take care of watermelon seedlings as part of the spring agricultural work in Fengcun Village of Dali County, northwest China's Shaanxi Province, Feb. 28, 2019. (Photos: Xinhua)

Farmers take care of peach trees as part of the spring agricultural work in Guduo Village of Dali County, northwest China's Shaanxi Province, Feb. 28, 2019.

Farmers apply greenhouse coverings as part of the spring agricultural work in Xiaopo Village, Anren Township of Dali County, northwest China's Shaanxi Province, March 1, 2019.

Farmers apply grafts to watermelon seedlings as part of the spring agricultural work in Fengcun Village of Dali County, northwest China's Shaanxi Province, Feb. 28, 2019.

A worker adjusts greenhouse sprinkler nozzles as part of the spring agricultural work in Fengcun Village of Dali County, northwest China's Shaanxi Province, Feb. 28, 2019.