Aerial photo taken on Aug. 20, 2019 shows farmers harvesting hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

Farmers harvest hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province, Aug. 20, 2019. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

Aerial photo taken on Aug. 20, 2019 shows a reaper harvesting hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

Aerial photo taken on Aug. 20, 2019 shows a farmer drying hybrid rice seeds at Zhouping Village in Zhuxi Town of Cengong County, southwest China's Guizhou Province. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

Farmers harvest hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province, Aug. 20, 2019. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

A reaper harvests hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province, Aug. 20, 2019. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

A reaper harvests hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province, Aug. 20, 2019. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

A reaper harvests hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province, Aug. 20, 2019. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

Farmers harvest hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province, Aug. 20, 2019. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)

Aerial photo taken on Aug. 20, 2019 shows farmers harvesting hybrid rice seeds at a national hybrid rice seed production base in Zhuxi Town of Cengong County, southwest China's Guizhou Province. The hybrid rice seeds here have entered harvest season. With the total cultivated area reaching more than 2,667 hectares, Cengong County has achieved an annual yield of eight million kilograms rice seeds. (Xinhua/Yang Wenbin)