Abstract: In order to investigate the effect of nitrogen application rate and transplanting density on rice quality under the field conditions, this paper adopted the split-plot experiment using a cold land Japonica rice Kenjing 7 as experimental material.  The nitrogen application rate (N) was used as the main plot (pure nitrogen was 0, 90, 120, 150, 180 kg·hm^-2, respectively) and the transplanting density (M) was used as the split block (20.2×104, 25.1×104, 33.3×104 hills·hm^-2, respectively). The results showed that: the effect of transplanting density on the processing quality of Kenjing 7 reached extremely significant level, as the transplanting density increased, the processing quality gradually increased. When the transplanting density was 33.3×104 hills·hm^-2, it was beneficial to improve the processing quality of the Kenjing 7. The interaction between nitrogen application rate and transplanting density had a significant effect on the appearance quality of Kenjing 7. When the nitrogen application rate was 180 kg·hm-2 and the transplanting density was 20.2×104 hills·hm^-2, it was beneficial to improve the appearance quality. The effect of nitrogen application rate on the nutritional quality and taste score of Kenjing 7 reached an extremely significant level. With the increase of nitrogen application rate, the nutritional quality gradually increased, and the taste quality gradually decreased. When the nitrogen application rate was 180 kg·hm^-2 and the transplanting density was 20.2×104 hills·hm^-2, it was beneficial to improve the nutritional quality of the Kenjing 7 but the taste quality of Kenjing 7 was reduced. In summary, the appearance quality and nutritional quality of Kenjing 7 were comparatively excellent under the treatment with 180 kg·hm^-2 of pure nitrogen and 20.2×104 hills·hm^-2 of transplanting density (N4M1).

Key words: rice, nitrogen application rate, transplanting density, processing quality, appearance quality, nutritional quality, taste quality

摘要： 为探讨施氮量及移栽密度对稻米品质的影响，在大田条件下，以垦粳7号为试验材料，采用裂区试验设计，以施氮量（0、90、120、150、180 kg·hm^-2，N）为主区和移栽密度（20.2万、25.1万、33.3万穴·hm^-2，M）为裂区，分析了氮密互作对稻米加工品质、外观品质、营养品质和食味品质的影响。结果表明：移栽密度对垦粳7号加工品质的影响达极显著水平，随移栽密度增加，加工品质逐渐增加，移栽密度为33.3万穴·hm^-2时，有利于提高垦粳7号的加工品质。施氮量与移栽密度的互作效应对垦粳7号外观品质的影响达显著水平，施氮量为180 kg·hm^-2、移栽密度为20.2 万穴·hm^-2时，有利于提高垦粳7号的外观品质。施氮量对垦粳7号营养品质和食味品质的影响达极显著水平，随施氮量增加，营养品质逐渐增加，食味品质逐渐降低；施氮量为180 kg·hm^-2、移栽密度为20.2万穴·hm^-2时，有利于提高垦粳7号的营养品质，而食味品质降低。综上，N4M1处理（180 kg·hm^-2和20.2 万穴·hm^-2）下，垦粳7号的外观品质和营养品质较优。

关键词: 水稻, 施氮量, 移栽密度, 加工品质, 外观品质, 营养品质, 食味品质