盐粳228群体特征及对氮的响应

2010年对盐粳228进行氮肥试验,研究该品种高产群体特征及对氮的响应。结果表明:该品种抽穗后干物质积累占籽粒产量的71%~81%,茎叶的表观转运率少,容易获得高产。该品种抽穗期适宜的叶面积指数(LAI)为7.0~7.5,叶色呈"三黑三黄"节奏变化,后期生长速率(CGR)高,收获指数(HI)介于0.8~1.1之间。氮肥的适量施用(330kgN.hm-2)不仅可以保证叶色"三黑三黄"节奏变化,建立抽穗期适宜LAI的群体,还可以保持高产株型特征,提高抽穗后期的LAI、叶面积维持期、CGR和HI,最终实现高产。

Population Characteristics of Japonica Rice Yanjing228 and Its Responses to Nitrogen

In order to study the high-yielding population characteristics of Japonica rice 228 and its responses to nitrogen,nitrogen fertilizer trails to Yanjing228 in 2010 Results showed that the dry matter accumulation after heading was 71%-81% of the grain yield.And the apparent translocation ratio of dry matter from stem and leaves to grain was small,which resulted in the high grain yield.For high-yielding rice population,the optimal LAI at heading should be 7.0-7.5.crop growth rate(CGR)from heading to maturity should be higher and the harvest index(HI) should be 0.8-1.1.The appropriate N rate could not only ensure the optimal LAI at heading,but also maintain the plant type characteristics of high-yielding rice,improve the LAI after heading,leaf area duration,CGR and HI,therefore achieve the super high grain yield.