籼粳杂交种亚优２号穗大粒多，增产潜力大，但结实率和谷粒充实率低，变异系数大；与汕优６３相比，抽穗期去掉５０％叶面积后，亚优２号的结实率和谷粒充实率下降较多，齐穗期去掉５０％颖花，亚优２号的结实率和谷粒充实率则增加较多；亚优２号的开花受精易受生态条件的影响；抽穗至成熟期水分胁迫对亚优２号的结实率和谷粒充实率影响较大，对汕优６３的影响相对较小；在抽穗期施用粒肥或６－苄基腺嘌呤能提高亚优２号的结实率和谷粒充实率。 Compared with Shanyou 63, after 50% of leaf area was removed at heading stage, Yayou No.2 The seed setting rate and grain filling rate dropped more, and the 50% spikelet at heading stage and the seed setting rate and grain filling rate at Yyou 2 increased more. The flowering and fertilization rate of Yyou 2 was affected by ecological conditions The effect of water stress from heading to maturity on seed setting rate and grain filling rate of Yayou 2 was relatively small, but the effect on Shanyou 63 was relatively small. Applying granulation fertilizer or 6-benzyl adenine at heading stage could increase Seed setting rate and grain filling rate of excellent No.2.