Beijing, August 1 (Youth.cn) - Photo taken in Zhongling village, Youyang Tujia and Miao Autonomous County, Chongqing city on July 31st. A plant protector were applying fertilizer to rice by a drone to assure a harvest autumn this year. By using a drone, one can economize 10% to 20% fertilizer while improving efficiency by 8 times compare to manual operation. Photo/VCG