优质杂交籼稻丰优香占高产栽培生长特性研究

Growth characteristics of hybrid indica rice 'Fengyouxiangzhan' under high yield culture

以汕优63为对照,进行了丰优香占4种栽插密度处理和4种施氮量处理的生长分析。结果显示:与汕优63相比,丰优香占在不同栽插密度和不同施氮条件下,成熟期总干物重高、齐穗至成熟生产的净光合产物多、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。丰优香占在不同密度、不同施氮量试验中,以密度30万穴/hm2、施氮量187.5 kg/hm2的处理产量最高,齐穗至成熟生产的净光合产物、成熟期叶面积指数、齐穗后25 d剑叶叶绿素含量和剑叶的光合速率等指标也有相同趋势。

In order to know the developmental characters of the rice＇Fengyouxiangzhan＇under high yield culture, we used the cultivar＇Shanyou 63＇as a control and made experiments of culturing the rice＇Fengyouxiangzhan＇at 4 planting densities and 4 application rates of nitrogen fertilizer in 2003 and 2004. The results showed that compared with Shanyou 63, the total dry matter weight of Fengyouxiangzhan at mature stage was greater, and its net photosynthate between full heading stage and mature stage was higher under all the planting densities and all the fertilizer application rates. In all the experiments, culturing Fengyouxiangzhan at the planting density of 300 000 hills/hm^2 and the application rate of 187.5 kg/hm^2 nitrogen fertilizer gained the highest yield. Such indexes as net photosynthate between full heading stage and mature stage, leaf area index at mature stage, and chlorophyll content and photosynthetic rate of flag leaf at 25 days after full heading also had the same tendency.