１９９８年江苏省大丰市种子公司杂交水稻特优５５９制种３３３．３ｈｍ２，平均单产２１６．５ｋｇ／６６７ｍ２，比上年增产１１．５ｋｇ／６６７ｍ２。增产的主要原因之一是高产制种技术逐步成熟和普及，出现了不少大面积平衡高产的制种村。例如，龙堤乡永跃村９９．３... In 1998, the hybrid rice Teyou 559 of Dafeng City, Jiangsu Province, had seed yield of 333.3hm2, with an average yield of 216.5kg / 667m2, an increase of 11.5kg / 667m2 over the previous year. One of the main reasons for the increase is that the technology of high-yielding seed production has gradually matured and popularized, and many seed production villages with large area and high yield have emerged. For example, Longyue Yongyue Village 99.3 ...