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在群体水培条件下,以国内外不同年代育成的常规籼稻代表品种(2001年为88个、2002年为122个)为材料,对植株的干物质量、氮素含量、产量及其构成因素、生育期、株高、成穗率、穗部性状等进行了测定。采用组内最小平方和的动态聚类方法将供试品种的氮素籽粒生产效率(NUEg)分为6种类型,研究不同NUEg类型品种生育期、株高、成穗率、穗部性状的基本特点。结果表明:1)高NUEg品种生育期(特别是播种至抽穗)较短,NUEg与全生育期、播种至抽穗天数呈显著负相关;2)不同NUEg类型品种间株高无显著差异,株高与NUEg无密切关系;3)高NUEg类型品种分蘖成穗率高,分蘖成穗率与干物质运转及氮素运转关系密切;4)高NUEg类型品种穗长较短,着粒密度较大。
Under the conditions of population hydroponics, the indica rice varieties (88 in 2001 and 122 in 2002), which were bred at different ages at home and abroad, were used to study the effects of dry matter weight, nitrogen content, yield and its components, Growth period, plant height, spike rate, panicle traits were measured. The dynamic clustering method based on the least square sum of the groups was used to classify the NUEg of the tested cultivars into six types to study the growth stages, plant height, spike rate and panicle traits of different NUEg cultivars Features. The results showed that: 1) There was a significant negative correlation between NUEg and the whole growth period and the days between heading and sowing in high NUEg cultivars (especially from sowing to heading); 2) There was no significant difference in plant height between different NUEg cultivars, Which is closely related to NUEg. 3) The tillering rate of tillers in high NUEg varieties is high, and the tillering rate is closely related to dry matter translocation and nitrogen translocation. 4) The varieties of high NUEg type have shorter spike length and larger grain density.