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我县1987年首次在里田乡塔下村春制威优64共622亩,总产149591公斤,平均亩产240.5公斤。其中,亩产超过350公斤的有53亩,曾宪堂种的1.29亩高产试验田,经县科委、农委、农业局、种子公司及乡村领导实地验收,亩产杂交种于406.85公斤,创我县杂交稻制种单产最高记录。其主要技术措施?
My county in 1987 for the first time in the village of Tower Village in the village of Tian Tian Chun Xiaodong 64 a total of 622 acres, with a total output of 149591 kilograms, an average yield of 240.5 kilograms. Among them, the mu yield of more than 350 kilograms of 53 acres, 1.29 acres of Zeng Xian Tang high-yielding experimental field, the county Science and Technology Committee, Agricultural Commission, Bureau of Agriculture, seed companies and rural leaders on-site inspection, mu yield of 406.85 kilograms of hybrids, Chong County Hybrid rice seed production highest record. The main technical measures?