Crops ›› 2023, Vol. 39 ›› Issue (1): 84-88.doi: 10.16035/j.issn.1001-7283.2023.01.012

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Effects of Nitrogen Application Rate on Rice Quality of High Quality Conventional Indica Rice

Wu Zishuai(), Liu Guanglin, Li Hu, Luo Qunchang, Chen Chuanhua(), Zhu Qi’nan   

  1. Rice Research Institute, Guangxi Academy of Agricultural Sciences/Guangxi Key Laboratory of Rice Genetics and Breeding, Nanning 530007, Guangxi, China
  • Received:2022-03-16 Revised:2022-04-02 Online:2023-02-15 Published:2023-02-22

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Abstract:

In order to investigate the effects of nitrogen application rate on conventional indica rice quality, Guixiang 18, Guiyu 12, Guiyu 9, Guiyu 11, Guiyu 18 and Guiyu 8 were used as materials, rice quality indexes under four nitrogen application rates were analyzed. The results showed that the brown rice rate and the milled rice rate increased first and then decreased with the increase of nitrogen application rate, and their values were higher when nitrogen application was 150.0kg/ha. The chalkiness rate and chalkiness degree of the tested varieties decreased with the increase of nitrogen application rate. Its lower value occured when nitrogen application was 150.0kg/ha or 187.5kg/ha. There was no significant difference in rice length and length-width ratio under nitrogen application of 150.0 and 187.5kg/ha. With the increase of nitrogen application rate, the amylose content of the tested varieties showed an upward trend, and the protein content increased significantly. The amylose content of the tested varieties reached the first-class quality standard when nitrogen application was 150.0kg/ha. In conclusion, under the experimental conditions, 150.0kg/ha was the most suitable nitrogen application rate to achieve better rice quality of the tested varieties.

Key words: High quality conventional indica rice, Nitrogen application rate, Processing quality, Appearance quality, Amylose content, Protein content

Table 1

Nitrogen fertilizer application period and amounts of different treatments kg/hm2"

处理
Treatment		 总施氮量
Total nitrogen
application rate		 返青肥（移栽后5d）
Greening fertilizer
(Five days after transplanting)		 分蘖肥（移栽后12d）
Tillering fertilizer
(12 days after transplanting)		 穗肥（移栽后40d）
Earing fertilizer
(40 days after transplanting)
N1 0.0 0.00 0.000 0.000
N2 112.5 33.75 50.625 28.125
N3 150.0 45.00 67.500 37.500
N4 187.5 56.25 84.375 46.875

Fig.1

Effects of nitrogen application rate on processing quality of high quality conventional indica rice Lowercase letters indicate significant difference at the 0.05 level,“*”indicates significant difference at the 0.05 level. The same below"

Table 2

Processing quality of high quality conventional indica rice under different nitrogen application rate %"

指标
Index		 处理
Treatment		 品种Variety
桂香18
Guixiang 18		 桂育12
Guiyu 12		 桂育9号
Guiyu 9		 桂育11号
Guiyu 11		 桂育18
Guiyu 18		 桂育8号
Guiyu 8
糙米率Brown rice rate N1 68.41±1.40b 68.63±1.50b 72.74±1.69b 74.93±0.52b 70.86±1.09b 73.06±1.00b
N2 71.20±0.88a 76.57±1.55a 76.78±1.01a 79.97±1.57a 76.79±1.01a 80.90±1.19a
N3 73.40±0.53a 76.78±1.01a 76.14±2.44a 81.63±0.44a 77.22±1.36a 80.84±0.80a
N4 72.93±0.97a 76.14±2.44a 76.57±1.05a 74.54±1.53b 75.48±2.08a 80.14±2.09a
整精米率Head rice rate N1 48.92±1.03b 50.95±1.19b 50.28±0.26b 56.77±0.60b 51.23±0.83b 63.04±0.51b
N2 51.43±0.24a 54.99±0.38a 54.90±1.45a 60.81±0.15a 55.10±0.25a 67.47±1.00a
N3 51.53±0.28a 55.07±0.28a 54.61±1.43a 61.14±0.29a 54.96±0.36a 67.29±1.63a
N4 51.56±0.25a 54.82±0.38a 54.71±1.89a 57.09±0.08b 55.01±0.23a 67.19±1.17a

Fig.2

Effects of nitrogen application rate on appearance quality of high quality conventional indica rice"

Table 3

Apperance quality of high quality conventional indica rice under different nitrogen application rate"

指标
Index		 处理
Treatment		 品种Variety
桂香18
Guixiang 18		 桂育12
Guiyu 12		 桂育9号
Guiyu 9		 桂育11号
Guiyu 11		 桂育18
Guiyu 18		 桂育8号
Guiyu 8
粒长Rice length (mm) N1 6.849±0.080b 6.398±0.025a 6.122±0.024b 5.997±0.111a 6.485±0.055a 6.412±0.142a
N2 6.841±0.078b 6.357±0.028a 6.244±0.050ab 6.032±0.049a 6.503±0.063a 6.355±0.017a
N3 6.956±0.035ab 6.326±0.064a 6.278±0.039a 6.082±0.042a 6.428±0.071a 6.376±0.045a
N4 7.015±0.081a 6.415±0.119a 6.295±0.038a 6.080±0.105a 6.426±0.100a 6.420±0.081a
长宽比Length-width ratio N1 3.998±0.017b 3.567±0.058a 3.312±0.004b 3.231±0.091a 3.247±0.037a 3.429±0.053a
N2 4.001±0.004b 3.557±0.033a 3.374±0.075ab 3.184±0.042a 3.274±0.012a 3.378±0.022a
N3 4.063±0.087ab 3.533±0.059a 3.397±0.020a 3.217±0.017a 3.243±0.050a 3.394±0.045a
N4 4.095±0.059a 3.560±0.070a 3.402±0.029a 3.226±0.055a 3.244±0.025a 3.425±0.023a
垩白粒率Chalkiness rate (%) N1 3.27±0.32a 3.64±0.32a 3.57±0.32a 5.24±0.41a 4.00±0.41a 4.82±0.37a
N2 2.52±0.46ab 2.85±0.41b 3.04±0.31ab 4.40±0.99b 3.82±0.47a 4.06±0.89b
N3 1.77±0.24bc 1.79±0.70c 2.72±0.34b 2.77±0.14c 2.47±0.40b 3.11±0.84c
N4 1.54±0.40c 1.79±0.35c 2.36±0.11b 2.87±0.19c 2.42±0.04b 3.21±0.22c
垩白度Chalkiness degree (%) N1 1.10±0.11a 1.22±0.11a 1.13±0.05a 1.59±0.05a 1.24±0.15a 1.55±0.12a
N2 0.84±0.15b 0.67±0.15b 1.02±0.10ab 1.47±0.33a 1.21±0.10a 1.36±0.30ab
N3 0.59±0.08c 0.63±0.18b 0.92±0.09b 0.93±0.05b 0.83±0.14b 1.21±0.05bc
N4 0.52±0.13c 0.60±0.12b 0.84±0.05b 0.96±0.07b 0.81±0.02b 1.08±0.09c

Fig.3

Effects of nitrogen application rate on amylose and protein contents of high quality conventional indica rice"

Table 4

Amylose and protein content of high quality conventional indica rice under different nitrogen application rate %"

指标
Index		 处理
Treatment		 品种Variety
桂香18
Guixiang 18		 桂育12
Guiyu 12		 桂育9号
Guiyu 9		 桂育11号
Guiyu 11		 桂育18
Guiyu 18		 桂育8号
Guiyu 8
直链淀粉含量Amylose content N1 13.10±0.45a 14.02±0.69b 14.53±0.28a 13.63±0.27b 12.98±0.78b 12.35±1.26b
N2 13.06±0.46a 14.22±1.19ab 14.40±0.68a 13.60±0.59b 12.95±0.50b 15.27±0.19a
N3 13.20±0.09a 14.37±1.31ab 14.54±1.38a 14.72±0.27a 14.29±0.16a 15.48±0.38a
N4 13.91±0.25a 15.23±0.31a 15.20±0.05a 14.75±0.13a 14.33±0.24a 15.36±0.41a
蛋白质含量Protein content N1 4.51±0.29c 4.03±0.14c 4.03±0.06c 5.20±0.34b 5.18±0.39b 4.64±0.27b
N2 4.96±0.14bc 4.81±0.27b 4.76±0.21b 5.33±0.36b 5.58±0.17ab 4.86±0.49b
N3 5.27±0.12ab 5.18±0.24b 4.94±0.44b 5.94±0.48a 5.88±0.37a 5.58±0.27a
N4 5.69±0.37a 5.85±0.42a 5.46±0.18a 5.94±0.45a 5.97±0.21a 6.07±0.66a
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