汕优 5 5 9是沿海地区农科所用珍汕 97Ａ和盐恢5 5 9配组育成的籼型杂交稻高产新组合 ,1998年 3月通过江苏省农作物品种审定委员会审定。为了探索汕优 5 5 9的高产栽培技术 ,为汕优 5 5 9大面积高产栽培提供理论依据 ,我们在 1997、1998年进行了以栽插密度为主区 ,以分蘖肥和穗 Shanyou 5 5 9 is a new high-yielding new combination of indica hybrid rice cultivated in Zhenshan 97A and Yanhui 5 5 9 used in coastal areas. It was approved by Jiangsu Province Crop Variety Approval Committee in March 1998. In order to explore the Shanyou 5 5 9 high-yielding cultivation techniques, to provide a theoretical basis for Shanyou 5 5 9 large-area high-yielding cultivation, we carried out in 1997, 1998 to planted density as the main area to tillering and panicle