摘要
[Objective] The aim was to research relationship between SPAD decline index after full-heading stage （SDIFHS） and productivity of rice. fertilized with nitro- gen in order to provide theoretical and practical references for selection and breed- ing of rice varieties. [Method] From 2008 to 2010, 18 mid-season hybrid rice vari- eties were researched every year to explore relationship＇ between SDIFHS and pro- ductivity of rice fertilized with nitrogen. [Result] The productivity of rice fertilized with nitrogen was of extremely significant positive corretation with SDIFHS, because the higher SPAD decline index is, the higher LAI decline index and the transformation ratio of dry matter to spikes in overground plant would be. [Conclusion] The re- search established a new method to predict productivity of rice fertilized with nitro- gen based on SPAD decline index.
[目的]研究水稻齐穗后叶片SPAD值衰减与氮素稻谷生产效率的关系，以期为杂交水稻氮肥高效利用的品种选育提供理论与实践依据。[方法]2008～2010年，每年以18个杂交中稻品种为材料，研究齐穗后叶片SPAD值衰减与氮素稻谷生产效率的关系。[结果]氮素稻谷生产效率与齐穗期至成熟期的植株叶片SPAD值衰减指数呈极显著正相关关系，其原因在于：SPAD值衰减指数越大，IAI衰减指数也越多，地上部干物质向穗部运转比例越高，以至氮素稻谷生产效率与收获指数呈极显著正相关。[结论]该研究建立了利用SPAD值衰减指数预测氮素稻谷生产效率的新方法。
基金
Supported by Southuest China Rice Innovation System and Crop High-yielding Project by Science and Technology (2011BAD02A05)
Transformation Project of Agricultural Fruits into Capitals (2006GB2F000256)
Sichuan Academic Leaders Training Fund
Sichuan Rice Cultivation Key Project
Sichuan Financial Distribution Project~~
