Abstract: The effects of silicon fertilizer rates on yield and quality of rice grain were studied with a mid-season japonica rice cultivar Wuyujing 3.With the increase of Si application rate,number of panicles per plant,number of grains per panicle,1000-grain weight and grain yield increased firstly and then decreased within the range of Si application rate of 0-450 kg/hm2,while milled rice rate and consistence showed a tendency to increase,and head rice rate increased significantly.The curves of RVA profile decreased,and amylose content,peak viscosity,hot viscosity,cool viscosity,peak time had the trend of descent,while setback decreased firstly and then increased.Meanwhile,brown rice rate and transparency had no obvious difference in the treatments.but proper Si rates decreased the chalky grain rate,chalkiness area and chalkiness,and increased protein content,gel consistency and breakdown.Considering the grain yield and quality together,225 kg/hm2 of Si fertilizer rate was suitable.

Key words: silicon, japonica rice, grain yield, quality traits, starch viscosity(RVA profile)

摘要： 以迟熟中粳稻武育粳3号为材料,研究了不同硅肥水平对粳稻产量和稻米品质的影响。结果表明，大田基施硅肥0~450 kg/hm2范围内，随着施硅量的增加，穗数、每穗粒数、千粒重、产量先增后降，精米率、回复值有增加的趋势，整精米率显著增加，RVA谱曲线降低，直链淀粉含量、峰值黏度、热浆黏度、冷胶黏度、到达峰值黏度时间呈下降的趋势，消减值则先下降然后上升。施硅对出糙率、透明度无明显影响。适量施硅可以降低垩白米率、垩白大小和垩白度，改善稻米的外观品质。施硅能提高稻米胶稠度、崩解值，有提高稻米蛋白质含量的趋势。综合产量和品质性状，以施硅肥225 kg/hm2的处理较好。

关键词: 硅, 粳稻, 稻谷产量, 品质性状, 淀粉黏滞性（RVA谱）