广阔的苏北平原,地处淮、沂、沭、泗下游,地势低洼,河湖密布,86%的土地在河湖水位以下。水稻是这里的主要作物,汛期排水不畅,低洼水田极易发生涝灾。为探索水稻耐淹性能,为水利工程设计、管理运用提供依据,为今后抗御洪涝灾害、指导农业生产积累可靠资料,我市于1986～1990年在丁集淮阴县农水试验站,对杂交水稻进行了五 The vast northern Jiangsu plain, is located in Huai, Yi, Shu, Si downstream, low lying, dense rivers and lakes, 86% of the land in rivers and lakes below the water level. Rice is the main crop here, poor drainage in flood season, low-lying paddy fields prone to floods. In order to explore the flooding resistance of rice, provide the basis for the design and management of water conservancy projects, and to provide credible data for the future resisting floods and guiding the agricultural production. In 1986-1990, Five conducted