Abstract:

By using rice varieties Wuxiangjing 14 and Wujing 15 as materials, the effects of nitrogen application on RVA profile characters under different soil fertility levels were studied. The curves of RVA profile decreased with the increased nitrogen rate. Soil fertility level and nitrogen rate had remarkable effects on the RVA profile characteristic value except one or two characteristic values. The interactive effect of soil fertility level and nitrogen was remarkable on hot viscosity, breakdown, cool viscosity, and consistence. With the increase of nitrogen rate, peak viscosity, hot viscosity, breakdown, cool viscosity, consistence and peak time decreased remarkably.The nitrogen rate of 225 kg/hm² was the critical on the cooking and eating quality of rice.

Key words: rice, nitrogen rate, soil fertility level, starch viscosity profile

摘要： 以武香粳14和武粳15为材料，研究了不同地力水平下施氮量对稻米淀粉RVA谱特性的影响。结果表明： 1）两供试品种在高、中、低3种地力水平下，RVA谱曲线随施氮量的增加而降低。2）除个别指标外，地力水平、施氮量对RVA谱特征值的影响，均达到显著或极显著的差异。3）在RVA特征值中，热浆黏度、崩解值、最终黏度和回复值存在显著的地力与施氮量互作效应。4）峰值黏度、热浆黏度、崩解值、最终黏度、回复值、峰值黏度时间随施氮量的增加呈显著或极显著下降，每1 hm2追施氮量225 kg是稻米蒸煮食味品质变劣的临界施氮量。

关键词: 水稻, 施氮量, 地力水平, 淀粉黏滞性谱