关键词: 空育131, 结实期, 氮肥, 品质

Abstract: [Objective] The aim of this study was to explore the effects of different nitrogen fertilizer on the quality of Kongyu 131 during the grain filling stage and to provide a theoretical basis for reasonable application of nitrogen fertilizer. [Method] Effects of 5different nitrogen fertilizer on the quality of Kongyu 131 were investigated using randomized block design during the grain filling stage. [Results] The milling quality of Kongyu 131 and nitrogen rate in seed setting period showed a single peak curve. There was an optimal value when the nitrogen rate was 22.5 kg/hm². The chalky rice rate and chalkiness degree both increased with an increase in nitrogen rate. The protein content showed a single peak curve and the difference was significant. However, there were no significant differences in amylose and fatty acid contents between treatments. The effect of low nitrogen on rice quality was not obvious but the comprehensive taste of Kongyu 131 showed decreasing trend when the nitrogen fertilizer rate was 90 kg/hm². [Conclusion] In cold regions, when the amount of nitrogen fertilizer is 22.5 kg/hm², Kongyu 131 quality is the best.

Key words: Kongyu 131, grain filling stage, N-fertilizer, quality