[Voiceover] Hovering above green fields of winter wheat in east China's Shandong Province, a group of drones get to work. They're part of an effort to boost winter wheat yields and sustain crop growth with modern technology, including a fleet of 350 agricultural drones. The drones fly along pre-programmed routes to evenly-distribute pesticides and fertilizers that prevent crop diseases, pests, and premature aging. Farmers say the drones save time and money. [Soundbite] Li Qinghua, farmer： "Previously, one farmer used to spray agriculture chemicals on around 0.67 hectares of land in a day. Now, drones can spray about 13.33 hectares of land in just one hour, significantly saving labor costs." [Restrictions: No access Chinese mainland]