氮肥用量对机插优质粳稻武运粳27号产量和品质的影响

Effects of Nitrogen Application Rate on Grain Yield and Quality of Mechanical Transplant-ing Japonica Rice Wuyunjing 27

在水稻塑盘育秧机插条件下，研究了不同氮肥用量对优质粳稻武运粳27号产量和品质的影响。结果表明，随氮肥用量的增加，机插粳稻武运粳27号的有效穗数、每穗粒数和产量呈先增后减趋势，结实率和千粒重则表现为随氮肥用量增加而减小的趋势；随施氮量的增加，糙米率、精米率和整精米率呈先增加后减小的趋势，精米蛋白质含量呈增加趋势，而稻米的直链淀粉含量、食味值和淀粉RVA谱曲线峰值（峰值黏度、热浆黏度和冷胶黏度）呈下降趋势。综合产量与品质结果，建议武运粳27号机插氮肥用量宜控制在225～300 kg/hm2之间。

The effects of nitrogen application rate on grain yield and quality were investigated using fine quality japonica rice cultivar Wuyunjing 27 under mechanical transplanting cultivation pattern. The results showed that the effective panicles, the number of grains per panicle, and the grain yield increased first and then decreased with the increase of nitrogen application rate, while the seed setting rate and 1000-grain weight decreased. The brown rice rate, milled rice rate and head rice rate increased first and then decreased with the increase of nitrogen application rate, the grain protein content increased, while the amylase content, taste value, peak viscosity, hot viscosity, cool viscosity of rice starch decreased. Considering both the grain yield and quality, the 225~300 kg/hm2 of nitrogen fertilizer rate is suitable for Wuyunjing 27.