协优57穗部性状及不同抽穗期分蘖成穗规律分析

（１）协优５７穗部性状分析结果表明：穗长与穗粒数呈极显著正相关。１次枝梗数与２次枝粳数、２次枝梗结实率与穗结实率呈显著正相关；２次枝梗着粒密度与１次枝梗着粒密度都很稳定，变幅分别是１．２０６～１．２６７粒／ｃｍ与０．５４３～０．７４３粒／ｃｍ。（２）不同时期分蘖穗粒结构：秧田分蘖穗及主茎穗的穗粒数多、结实率高，大田低位蘖次之；大田高位蘖最少。与汕优６３相比：协优５７秧田分蘖穗、主茎穗、大田低位蘖次之；大田低位蘖穗的穗粒数、结实率相关不大，而大田高位蘖穗的穗粒数、结实率较高。结论：协优５７的每穗粒数多、结实率高是其高产的主要原因。

Analysis of the character of the panicle of“Xie you 57”

The results of the analysis of the panicle character of“Xie You 57” showed that:the interrelated coefficients between the length of the panicle and the spikelets of per panicle,between the number of the first branch and the second branchs;and the rate of seed setting of the second branchs to the panicle were significantly positive.The density of seed setting of the second branch and the first branch were all steady.(2)The results of the analysis of the tillers spikes at the various stages showed that the spikelets and the rate of seed setting were in order:the tillers spikes in the nursery bed and the main spike>the tiller's spikes at low place in the field>the tiller's spikes at high place in the field.