优质杂交籼稻丰优香占群体生长特性的研究

Population developing characteristics of hybrid rice with good quality,Fengyouxiangzhan

以汕优63为对照,研究不同栽插密度和施氮量处理丰优香占群体生长发育特性。结果表明:与汕优63相比,丰优香占在不同栽插密度和施氮量条件下,成熟期总干物重高、齐穗至成熟期净光合产物多、增产显著,表明丰优香占具有稻谷高产的物质基础,对栽插密度和施氮量适应范围宽。丰优香占在不同栽插密度和施氮量试验中,以密度为30万穴.hm-2、施氮量为187.5 kg.hm-22个处理的产量最高,齐穗至成熟期净光合产物、成熟期叶面积指数、齐穗后25 d剑叶叶绿素含量和光合速率等指标也有相同趋势。合理密植,适宜的施氮量,可以确保丰优香占创造合理的群体,取得较多穗数和较高干物质积累,从而提高生物学产量和稻谷产量。

To know the developing characteristics of Fengyouxiangzhan for high yield cultivation,we studied the dynamic growth of Fengyouxiangzhan under different transplanting density and nitrogenous fertilizer treatments using Shanyou 63 as control in 2003 and 2004.The comparison results showed that total dry weight at mature stage,net photosynthate from heading to mature stage of Fengyouxiangzhan were higher than that of Shanyou 63 in density and fertilizer experiment,which provided material foundation for its high...