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Acta Agronomica Sinica ›› 2022, Vol. 48 ›› Issue (7): 1730-1745.doi: 10.3724/SP.J.1006.2022.12039

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Combined effects of panicle nitrogen fertilizer amount and shading during grain filling period on grain quality of conventional japonica rice

TAO Yu(), YAO Yu, WANG Kun-Ting, XING Zhi-Peng(), ZHAI Hai-Tao, FENG Yuan, LIU Qiu-Yuan, HU Ya-Jie, GUO Bao-Wei, WEI Hai-Yan, ZHANG Hong-Cheng   

  1. Jiangsu Key Laboratory of Crop Cultivation and Physiology / Jiangsu Co-innovation Center for Modern Production Technology of Grain Crops / Research Institute of Rice Industrial Engineering Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China
  • Received:2021-06-06 Accepted:2021-10-19 Online:2022-07-12 Published:2021-11-17
  • Contact: XING Zhi-Peng E-mail:1067216721@qq.com;zpxing@yzu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(31801293);National Natural Science Foundation of China(31971841);National Key Research and Development Program of China(2016YFD0300503);Innovative Training Program for College Students of Jiangsu Province(202011117087Y);Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)

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Abstract:

Panicle nitrogen fertilizer amount and shading during grain filling period directly and obviously regulated the relationship between carbon and nitrogen metabolism of rice grains by affecting leaf photosynthesis and plant nitrogen nutrition, which would be benefit to forming different characteristics of rice quality. In order to investigate the combined effect between panicle nitrogen fertilizer amount and shading during grain filling period on quality of conventional japonica rice, field experiments were carried out with three panicle nitrogen application treatments of 40.5 kg hm-2 (N1), 81.0 kg hm-2 (N2) and 121.5 kg hm-2 (N3) at the same amount of basal and tilling fertilizers, and two artificial shading treatments of 100% natural light (S0) and 50% natural light (S50) during grain filling period in 2019 and 2020. The quality characteristics of conventional japonica rice Huaidao 5, Nanjing 9108, and Yangnongxiang 28 were determined under different light and nitrogen conditions during grain filling period. Results showed that with the increase of panicle nitrogen fertilizer amount, the brown rice rate, milled rice rate, and heading rice rate firstly increased and then decreased under S0 and decreased under S50. The brown rice rate, milled rice rate and heading rice rate of S0 were significantly higher than S50, while the processing quality of S0N2 with higher heading rice rate was the best among all treatments. The chalkiness grain percentage and chalkiness degree of rice had a trend of S50N3 > S50N2 > S50N1 > S0N3 > S0N2 > S0N1. Therefore, the increase of panicle nitrogen fertilizer amount and the shading during grain filling period had a cumulative effect on the increase of chalkiness grain rate and chalkiness degree of rice. Both the increase of panicle nitrogen fertilizer amount and shading during grain filling period decreased the amylose content and gel consistency, but increased the protein content. And the variation coefficient of glutelin was higher than other protein components among treatments. The rice taste value was decreased with the increase of panicle nitrogen fertilizer amount and the shading during grain filling period, while the direct influence of taste characteristic value on taste value was different among rice varieties. The peak viscosity and breakdown viscosity of rice starch decreased with the increase of panicle nitrogen fertilizer amount and the shading during grain filling period, while the setback viscosity increased. And the combination of light and nitrogen increased the difference of the above viscosity indexes among treatments. Based on the ratio of amylose content to protein content under different treatments of panicle nitrogen fertilizer amount and shading during grain filling period, the carbon and nitrogen metabolism ability of plants at grain filling stage were changed. In addition, the amylose content and protein content were significantly negatively correlated with taste value, while the correlation coefficient of protein was bigger than amylose content. Thus, an appropriate reduction of panicle nitrogen application fertilizer amount was beneficial to the improvement of rice processing quality, appearance quality and cooking and eating quality at grain filling stage with shading. The reduction of amylose content and especially the reduction of protein content might be an effective way to improve rice taste. The results would provide scientific support for the innovation of high yield and good taste rice cultivation techniques.

Key words: panicle nitrogen fertilizer amount, shading during grain filling period, conventional japonica rice, rice grain quality

Fig. 1

Sunshine hour, mean temperature, and precipitation during rice growing seasons in 2019 and 2020"

Table 1

Treatments of panicle nitrogen fertilizer amount"

处理
Treatment		 N (kg hm-2) P2O5
(kg hm-2)		 K2O
(kg hm-2)
基肥
Basal fertilizer		 分蘖肥
Tillering fertilizer		 促花肥
Flower-promoting fertilizer		 保花肥
Flower-preserving fertilizer		 总计
Total
N1 94.50 94.50 20.25 20.25 229.50 135.00 270.00
N2 94.50 94.50 40.50 40.50 270.00 135.00 270.00
N3 94.50 94.50 60.75 60.75 310.50 135.00 270.00

Table 2

Analysis of variance for main rice quality traits"

变异来源
Source of variation		 品种
Variety		 结实期遮光
S		 穗肥氮素用量
N		 V×S V×N S×N V×S×N
2019
自由度df 2 1 2 2 4 2 4
糙米率BR 43.64** 865.15** 10.23** 11.50** 1.44 6.42** 0.59
精米率MR 7.74** 562.23** 5.04* 6.96** 1.05 14.01** 1.78
整精米率HMR 37.43** 579.52** 175.22** 33.10** 7.18** 19.25** 18.90**
长宽比L/W 711.69** 57.22** 12.92** 0.84 0.69 0.25 0.10
垩白粒率CR 1960.53** 1596.48** 44.69** 204.25** 4.30* 1.72 5.97**
垩白度CD 1587.24** 1354.16** 70.92** 286.02** 5.76** 0.05 3.24*
蛋白质含量PC 249.22** 2873.18** 328.95** 12.31** 19.03** 8.55** 12.91**
直链淀粉含量AC 2486.33** 212.73** 47.42** 4.19* 11.12** 17.67** 4.32*
变异来源
Source of variation		 品种
Variety		 结实期遮光
S		 穗肥氮素用量
N		 V×S V×N S×N V×S×N
胶稠度GC 40.53** 136.71** 56.39** 29.37** 1.97 9.22** 4.75**
峰值黏度PKV 27.69** 98.86** 46.49** 12.00** 0.42 0.23 0.42
崩解值BDV 34.00** 27.30** 4.95* 0.19 0.19 0.35 0.16
消减值SBV 209.41** 37.66** 3.86* 0.21 0.16 0.27 0.26
食味值TV 98.63** 262.66** 88.13** 3.99* 3.76* 7.86** 1.07
2020
自由度df 2 1 2 2 4 2 4
糙米率BR 51.22** 837.95** 12.06** 29.34** 0.49 21.88** 0.63
精米率MR 38.68** 779.72** 6.24** 5.08* 0.89 11.25** 0.57
整精米率HMR 31.87** 963.21** 29.69** 17.68** 0.40 24.29** 0.22
长宽比L/W 982.48** 185.21** 5.55* 16.92** 0.21 0.05 0.48
垩白粒率CR 222.88** 157.15** 10.49** 18.72** 0.14 0.08 0.99
垩白度CD 1069.80** 979.58** 77.22** 136.40** 5.47** 12.16** 4.79**
蛋白质含量PC 12.05** 1594.94** 524.65** 12.57** 35.05** 45.89** 10.57**
直链淀粉含量AC 2579.38** 320.68** 59.30** 27.81** 8.99** 17.59** 5.22**
胶稠度GC 21.77** 259.25** 44.90** 7.94** 3.51* 9.49** 1.07
峰值黏度PKV 302.75** 689.50** 48.70** 13.19** 0.85 3.71* 1.94
崩解值BDV 27.58** 45.75** 2.30 0.32 0.04 0.16 0.04
消减值SBV 359.27** 74.45** 2.65 1.95 0.07 0.22 0.18
食味值TV 1409.90** 302.24** 159.91** 29.46** 3.47* 6.91** 11.07**

Table 3

Effects of panicle nitrogen fertilizer amount and shading during grain filling period on rice processing quality"

品种
Variety		 结实期
遮光S		 穗肥氮素
用量N		 青米率
GR (%)		 糙米率
BR (%)		 精米率
MR (%)		 整精米率
HMR (%)		 糙米产量
BY (kg hm-2)		 精米产量
MR (kg hm-2)		 整精米产量
HMR (kg hm-2)
2019
淮稻5号
Huaidao 5		 S0 N1 3.5 c 84.3 a 75.4 a 72.4 a 8183.8 c 7317.6 c 7024.9 b
N2 3.9 bc 84.7 a 76.4 a 72.8 a 8850.3 a 7976.0 a 7605.2 a
N3 5.4 bc 83.6 a 75.7 a 66.4 b 8566.0 b 7752.9 b 6803.8 c
S50 N1 7.1 ab 79.3 b 71.3 b 66.3 b 5483.5 f 4931.6 e 4583.4 d
N2 9.8 a 79.0 b 70.2 b 64.0 c 5877.4 d 5223.3 d 4764.5 d
N3 10.4 a 77.6 c 70.1 b 62.5 c 5727.2 e 5177.6 d 4611.7 d
南粳9108
Nanjing 9108		 S0 N1 4.6 b 81.6 b 74.5 b 71.3 a 8141.7 c 7438.2 c 7117.2 b
N2 4.8 b 83.1 a 76.7 a 71.4 a 8828.9 a 8141.1 a 7586.4 a
N3 5.4 b 81.4 b 74.7 b 64.9 bc 8545.3 b 7836.2 b 6813.8 c
S50 N1 10.8 a 78.2 c 71.7 c 66.8 b 5361.3 f 4920.6 f 4584.5 d
N2 11.4 a 77.9 c 71.7 c 64.7 c 5602.3 d 5157.8 d 4653.9 d
N3 11.8 a 77.0 c 71.1 c 61.5 d 5450.7 e 5029.5 e 4354.4 e
扬农香28
Yangnongxiang 28		 S0 N1 6.1 d 81.7 b 74.2 b 70.6 a 7031.4 c 6379.7 c 6073.6 c
N2 8.3 cd 83.4 a 75.9 a 71.3 a 8696.6 a 7914.8 a 7430.0 a
N3 10.8 bc 82.7 ab 75.5 a 67.2 b 8355.4 b 7630.0 b 6786.5 b
品种
Variety		 结实期
遮光S		 穗肥氮素
用量N		 青米率
GR (%)		 糙米率
BR (%)		 精米率
MR (%)		 整精米率
HMR (%)		 糙米产量
BY (kg hm-2)		 精米产量
MR (kg hm-2)		 整精米产量
HMR (kg hm-2)
S50 N1 11.6 b 76.5 c 71.0 c 66.8 b 4563.3 e 4237.3 e 3987.6 d
N2 13.3 b 76.0 c 69.5 d 58.8 c 5312.7 d 4855.5 d 4109.6 d
N3 17.8 a 75.7 c 68.5 d 51.5 d 5267.0 d 4768.7 d 3582.4 e
2020
淮稻5号
Huaidao 5		 S0 N1 2.1 c 85.2 a 76.9 a 76.1 a 7702.8 c 6953.3 c 6885.9 c
N2 3.0 c 85.3 a 77.3 a 76.5 a 8507.5 a 7709.7 a 7626.4 a
N3 3.4 c 85.3 a 77.1 a 75.5 a 8151.4 b 7366.0 b 7218.2 b
S50 N1 4.3 c 83.0 b 73.3 b 67.9 b 5975.8 e 5274.8 e 4885.9 d
N2 10.4 b 82.1 c 71.7 c 63.6 c 6380.2 d 5571.8 d 4946.4 d
N3 14.2 a 81.3 d 71.6 c 62.3 c 6407.7 d 5640.1 d 4910.3 d
南粳9108
Nanjing 9108		 S0 N1 2.2 c 85.2 a 78.0 ab 76.9 a 8220.3 c 7524.7 b 7417.1 b
N2 2.6 c 85.4 a 78.8 a 77.3 a 8387.9 a 7740.3 a 7592.4 a
N3 5.0 bc 85.3 a 77.7 b 75.6 a 8290.1 b 7553.5 b 7347.3 b
S50 N1 7.9 ab 83.5 b 74.8 c 72.4 b 6055.5 e 5425.8 c 5250.2 c
N2 8.9 a 83.2 b 74.4 c 67.2 c 6151.9 d 5497.8 c 4965.8 d
N3 10.3 a 82.0 c 73.9 c 65.7 c 6089.9 de 5488.8 c 4879.4 d
扬农香28
Yangnongxiang 28		 S0 N1 2.3 e 84.5 a 77.2 a 75.4 a 8280.1 b 7556.7 b 7382.7 b
N2 3.6 de 85.2 a 77.6 a 76.2 a 8720.3 a 7941.0 a 7796.6 a
N3 6.0 d 85.1 a 77.3 a 75.5 a 8657.8 a 7861.2 a 7682.1 a
S50 N1 11.3 c 81.3 b 73.6 b 65.7 b 5580.9 d 5051.6 c 4509.3 c
N2 14.7 b 80.4 c 72.1 c 62.0 c 5535.0 d 4960.8 d 4267.6 d
N3 18.5 a 79.7 c 72.0 c 59.9 c 5668.0 c 5118.6 c 4256.4 d

Table 4

Effects of panicle nitrogen fertilizer amount and shading during grain filling period on rice appearance quality"

品种
Variety		 结实期遮光
S		 穗肥氮素用量
N		 长宽比L/W 垩白粒率CR (%) 垩白度CD (%)
2019 2020 2019 2020 2019 2020
淮稻5号
Huaidao 5		 S0 N1 1.75 b 1.76 b 40.0 b 48.0 c 12.3 c 19.8 e
N2 1.75 b 1.76 b 42.0 b 51.5 c 13.0 c 21.4 de
N3 1.77 b 1.78 ab 42.3 b 52.0 c 13.1 c 22.0 d
S50 N1 1.78 ab 1.78 ab 65.4 a 66.5 b 21.4 b 29.2 c
N2 1.79 ab 1.78 ab 66.2 a 72.0 ab 22.2 ab 35.7 b
N3 1.80 a 1.79 a 67.9 a 75.4 a 22.8 a 38.5 a
南粳9108
Nanjing 9108		 S0 N1 1.63 b 1.67 b 23.1 d 38.1 d 7.3 e 12.3 e
N2 1.63 b 1.67 b 26.5 c 43.4 cd 8.4 d 14.1 d
N3 1.64 b 1.68 b 31.9 b 45.9 bc 10.6 ab 16.3 c
S50 N1 1.65 ab 1.72 a 33.2 b 51.5 ab 9.6 c 21.1 b
N2 1.66 a 1.72 a 33.5 b 52.3 ab 10.1 bc 24.2 a
N3 1.67 a 1.73 a 37.0 a 54.7 a 11.4 a 25.5 a
扬农香28
Yangnongxiang 28		 S0 N1 1.77 b 1.82 b 21.8 c 30.6 b 6.7 d 10.6 b
N2 1.79 ab 1.83 b 21.8 c 31.6 b 6.8 d 11.1 b
N3 1.79 ab 1.83 b 22.7 c 33.7 ab 8.3 c 11.9 b
S50 N1 1.79 ab 1.87 a 31.7 b 34.4 ab 10.1 b 12.1 b
N2 1.81 a 1.87 a 32.2 b 40.0 a 10.7 b 14.2 a
N3 1.81 a 1.88 a 38.3 a 40.3 a 12.9 a 15.1 a

Table 5

Effects of panicle nitrogen fertilizer amount and shading during grain filling period on rice cooking, taste, and nutritional quality"

品种
Variety		 结实期
遮光
S		 穗肥氮素
用量
N		 直链淀粉
含量
AC (%)		 胶稠度
GC (mm)		 蛋白质含量
PC (%)		 AC/PC 蛋白组分含量(干基)
Protein component content (dry base) (mg g-1)
清蛋白
Albumin		 球蛋白
Globulin		 醇溶蛋白
Prolamin		 谷蛋白
Glutelin
2019
淮稻5号
Huaidao 5		 S0 N1 19.9 a 75.3 a 9.4 e 2.11 a 4.83 c 4.46 c 5.83 d 47.79 e
N2 19.8 a 75.1 a 9.7 d 2.04 a 4.87 c 4.77 b 6.38 bc 52.99 d
N3 18.9 b 75.0 a 10.5 c 1.79 b 5.20 ab 4.82 b 6.53 b 54.67 d
S50 N1 19.2 ab 68.7 b 10.5 c 1.84 b 4.96 bc 4.99 b 6.29 c 58.02 c
N2 17.8 c 64.3 c 11.8 b 1.50 c 5.13 abc 5.49 a 6.87 a 65.24 b
N3 14.9 d 56.7 d 12.2 a 1.22 d 5.30 a 5.73 a 6.98 a 70.61 a
南粳9108
Nanjing 9108		 S0 N1 10.4 a 65.7 a 9.8 e 1.06 a 4.87 d 5.04 d 6.08 c 48.09 e
N2 10.2 ab 63.7 ab 10.1 d 1.00 ab 5.11 d 5.05 d 6.20 c 50.60 e
品种
Variety		 结实期
遮光
S		 穗肥氮素
用量
N		 直链淀粉
含量
AC (%)		 胶稠度
GC (mm)		 蛋白质含量
PC (%)		 AC/PC 蛋白组分含量(干基)
Protein component content (dry base) (mg g-1)
清蛋白
Albumin		 球蛋白
Globulin		 醇溶蛋白
Prolamin		 谷蛋白
Glutelin
N3 10.0 ab 60.3 bc 10.4 c 0.96 b 5.92 b 5.22 cd 6.44 b 56.66 d
S50 N1 9.6 b 65.0 a 11.6 b 0.83 c 5.43 c 5.44 bc 6.85 a 61.71 c
N2 8.4 c 63.7 ab 12.1 a 0.69 d 5.59 c 5.61 b 6.88 a 66.95 b
N3 8.4 c 58.0 c 12.3 a 0.68 d 6.59 a 6.08 a 6.93 a 76.22 a
扬农香28
Yangnongxiang 28		 S0 N1 10.3 a 72.7 a 8.5 e 1.21 a 4.39 d 4.04 d 6.23 b 47.24 c
N2 10.3 a 72.6 a 9.0 d 1.14 a 5.09 b 4.24 d 6.28 b 49.35 c
N3 10.1 ab 64.7 b 9.9 c 1.02 b 6.38 a 4.52 c 6.38 b 50.60 c
S50 N1 9.4 b 69.7 a 10.8 b 0.88 c 4.78 c 4.81 b 6.97 a 64.54 b
N2 8.3 c 60.3 c 10.9 b 0.76 d 5.25 b 4.82 b 7.06 a 65.60 b
N3 8.1 c 57.0 c 11.7 a 0.70 d 6.62 a 5.14 a 7.14 a 72.98 a
2020
淮稻5号
Huaidao 5		 S0 N1 18.7 a 73.3 a 9.3 e 2.02 a 3.75 b 4.01 d 5.66 c 45.65 c
N2 18.7 a 73.0 a 9.7 d 1.97 a 3.78 b 4.09 cd 5.82 bc 49.87 b
N3 18.0 b 72.0 a 10.1 c 1.84 b 3.80 b 4.10 cd 6.02 b 51.99 b
S50 N1 17.0 c 67.0 b 10.2 c 1.68 c 4.03 ab 4.18 bc 5.89 bc 51.20 b
N2 16.7 c 62.7 c 11.6 b 1.47 d 4.15 a 4.25 ab 6.34 a 62.53 a
N3 13.7 d 60.7 c 12.0 a 1.17 e 4.29 a 4.30 a 6.57 a 64.66 a
南粳9108
Nanjing 9108		 S0 N1 10.7 a 72.0 a 8.6 f 1.27 a 4.05 d 4.27 b 5.89 c 41.08 f
N2 10.6 a 70.0 ab 9.7 d 1.10 b 4.29 cd 4.28 b 5.93 c 48.00 d
N3 10.2 ab 65.7 c 10.2 c 1.02 b 4.44 bc 4.35 ab 6.15 bc 51.59 c
S50 N1 9.9 b 67.3 bc 9.2 e 1.08 b 4.73 ab 4.35 ab 6.23 b 43.57 e
N2 9.9 b 65.7 c 11.3 b 0.89 c 4.77 a 4.39 a 6.30 ab 58.79 b
N3 9.1 c 56.7 d 12.4 a 0.74 d 4.85 a 4.41 a 6.53 a 66.23 a
扬农香28
Yangnongxiang 28		 S0 N1 10.4 a 70.7 a 8.8 f 1.21 a 3.96 c 3.93 c 5.73 c 43.14 f
N2 9.8 a 69.3 a 9.1 e 1.12 b 4.09 bc 3.93 c 5.81 c 46.32 e
N3 9.7 ab 68.0 a 10.0 d 1.00 c 4.19 bc 3.98 c 6.13 b 51.29 d
S50 N1 9.1 b 64.0 b 10.6 c 0.87 d 4.31 ab 4.20 b 6.24 b 54.57 c
N2 8.1 c 57.0 c 11.2 b 0.74 e 4.53 a 4.28 b 6.65 a 59.51 b
N3 7.3 d 53.0 d 11.9 a 0.63 f 4.56 a 4.44 a 6.78 a 62.79 a

Table 6

Effects of panicle nitrogen fertilizer amount and shading during grain filling period on rice taste value and its characteristic value"

品种
Variety		 结实期遮光
S		 穗肥氮素用量
N		 外观
Appearance		 硬度
Hardness		 黏度
Viscosity		 平衡度
Balance		 食味值
Taste value
2019
淮稻5号
Huaidao 5
S0 N1 4.2 a 7.8 c 4.7 a 4.2 a 54.7 a
N2 3.0 b 8.3 b 3.7 b 3.2 b 48.3 b
N3 2.7 bc 8.4 ab 3.0 bcd 2.6 bc 44.9 bc
S50 N1 2.6 bc 8.6 a 3.4 bc 2.7 bc 45.3 bc
N2 2.2 cd 8.6 a 2.6 cd 2.2 cd 42.3 cd
N3 2.0 d 8.6 a 2.2 d 1.9 d 40.2 d
南粳9108
Nanjing 9108
S0 N1 5.1 a 7.2 c 5.3 a 5.0 a 60.3 a
N2 4.5 b 7.6 b 4.9 a 4.4 b 56.7 b
N3 3.8 c 7.6 b 3.5 b 3.7 c 51.5 c
S50 N1 3.0 d 8.1 a 3.3 b 3.0 d 47.5 d
N2 3.0 d 8.2 a 3.1 b 2.8 de 46.6 de
N3 2.7 d 8.3 a 2.3 c 2.4 e 43.7 e
扬农香28
Yangnongxiang 28
S0 N1 6.0 a 6.8 d 5.8 a 5.9 a 65.4 a
N2 5.2 b 6.9 d 4.9 b 5.1 b 60.5 b
N3 3.8 cd 7.8 b 3.8 c 3.6 d 51.3 d
S50 N1 4.3 c 7.4 c 4.6 b 4.4 c 55.9 c
N2 3.5 de 7.9 ab 3.4 c 3.3 de 49.3 de
N3 3.0 e 8.3 a 3.3 c 2.9 e 46.8 e
2020
淮稻5号
Huaidao 5		 S0 N1 5.8 a 6.8 c 5.7 a 5.7 a 64.5 a
N2 4.8 b 7.4 b 4.8 bc 4.6 b 57.0 b
N3 4.2 c 7.7 ab 4.0 d 3.9 c 53.0 c
S50 N1 4.8 b 7.6 ab 5.1 b 4.7 b 58.0 b
N2 4.4 bc 7.7 ab 4.6 c 4.3 b 55.0 c
N3 4.3 c 7.8 a 4.6 c 4.3 bc 55.0 c
南粳9108
Nanjing 9108		 S0 N1 8.3 a 5.8 c 8.1 a 8.1 a 79.5 a
N2 7.9 a 6.0 c 7.9 a 7.8 a 77.0 b
N3 7.3 b 6.3 b 7.3 b 7.1 b 73.5 c
S50 N1 7.1 b 6.4 ab 7.1 b 6.9 b 72.0 c
N2 6.6 c 6.6 a 6.4 c 6.4 c 69.0 d
N3 6.3 c 6.6 a 6.1 c 6.1 c 67.0 e
扬农香28
Yangnongxiang 28		 S0 N1 7.9 a 6.0 c 7.9 a 7.8 a 77.0 a
N2 7.3 b 6.3 b 7.3 b 7.1 b 73.5 b
N3 7.1 b 6.3 b 7.2 b 7.0 b 73.0 b
S50 N1 7.1 b 6.3 b 7.2 b 7.0 b 73.0 b
N2 6.5 c 6.6 a 6.5 c 6.4 c 69.0 c
N3 6.3 c 6.6 a 6.0 d 6.1 c 67.0 d

Table 7

Correlation coefficients of taste value and its characteristic values"

品种
Variety		 淮稻5号 Huaidao 5 南粳9108 Nanjing 9108 扬农香28 Yangnongxiang 28
简单相关系数
Simple correlation
coefficient		 直接通径系数
Direct path
coefficient		 简单相关系数
Simple correlation
coefficient		 直接通径系数
Direct path
coefficient		 简单相关系数
Simple correlation
coefficient		 直接通径系数
Direct path
coefficient
外观Appearance 0.996** 0.096 0.999** 0.585 0.998** 0.377
硬度Hardness -0.970** -0.300 -0.991** -0.119 -0.987** -0.291
黏度Viscosity 0.978** 0.384 0.995** 0.313 0.995** 0.523
平衡度Balance 0.999** 0.236 0.999** -0.015 0.999** -0.186

Table 8

Effects of panicle nitrogen fertilizer amount and shading during grain filling period on RVA profile characteristics of rice"

品种
Variety		 结实期遮光
S		 穗肥氮素用量
N		 峰值黏度
PKV (cP)		 热浆黏度
HTV (cP)		 最终黏度
FLV (cP)		 崩解值
BDV (cP)		 消减值
SBV (cP)		 糊化温度
PaT (℃)
2019
淮稻5号
Huaidao 5		 S0 N1 2289 a 1466 a 2471 a 823 a 182 c 73.6 a
N2 2187 ab 1380 b 2380 b 807 a 193 c 73.6 a
N3 2085 bc 1291 c 2290 c 794 a 205 bc 73.7 a
S50 N1 1946 c 1250 c 2254 c 696 ab 308 abc 74.1 a
N2 1773 d 1131 d 2122 d 642 ab 349 ab 74.3 a
N3 1663 d 1083 d 2046 e 580 b 383 a 74.4 a
南粳9108
Nanjing 9108		 S0 N1 2095 a 1205 a 1942 a 890 a -153 c 74.1 a
N2 1982 ab 1100 b 1833 b 882 a -149 c 74.1 a
N3 1883 bc 1064 b 1775 b 819 ab -108 bc 74.3 a
S50 N1 2005 ab 1205 a 1932 a 800 ab -73 abc 74.4 a
N2 1816 cd 1097 b 1824 b 719 ab 8 ab 74.3 a
N3 1705 d 1063 b 1773 b 642 b 68 a 74.4 a
扬农香28
Yangnongxiang 28		 S0 N1 2397 a 1268 a 1998 a 1129 a -399 b 73.4 a
N2 2160 bc 1101 c 1828 b 1059 ab -332 ab 73.5 a
N3 2049 bcd 1065 cd 1752 cd 984 ab -297 ab 74.4 a
S50 N1 2202 b 1195 b 1938 a 1007 ab -264 ab 74.3 a
N2 2022 cd 1115 c 1809 bc 907 b -213 a 74.3 a
N3 1912 d 1031 d 1717 d 881 b -195 a 74.4 a
2020
淮稻5号
Huaidao 5		 S0 N1 2495 a 1580 a 2454 a 915 a -41 b 74.6 a
N2 2462 a 1565 a 2431 a 897 a -31 b 74.6 a
N3 2407 a 1552 ab 2406 a 855 ab -1 b 74.8 a
S50 N1 2164 b 1441 bc 2307 b 723 abc 143 a 74.5 a
N2 2092 b 1410 c 2262 b 682 bc 170 a 74.7 a
N3 1861 c 1225 d 2063 c 636 c 202 a 74.8 a
品种
Variety		 结实期遮光
S		 穗肥氮素用量
N		 峰值黏度
PKV (cP)		 热浆黏度
HTV (cP)		 最终黏度
FLV (cP)		 崩解值
BDV (cP)		 消减值
SBV (cP)		 糊化温度
PaT (℃)
南粳9108
Nanjing 9108		 S0 N1 2035 a 1146 a 1575 a 889 a -460 b 74.4 a
N2 1941 b 1104 ab 1528 a 837 ab -413 ab 74.4 a
N3 1870 b 1058 abc 1480 ab 812 ab -390 ab 74.6 a
S50 N1 1747 c 1018 bc 1416 bc 729 ab -331 ab 74.7 a
N2 1660 cd 1001 bc 1373 cd 659 b -287 a 74.8 a
N3 1591 d 942 c 1308 d 649 b -283 a 74.8 a
扬农香28
Yangnongxiang 28		 S0 N1 2377 a 1240 a 1669 a 1137 a -708 b 73.2 a
N2 2306 ab 1185 a 1600 ab 1121 a -706 b 73.2 a
N3 2241 b 1152 a 1566 b 1089 a -675 b 73.2 a
S50 N1 1961 c 1001 b 1418 c 960 ab -543 a 73.3 a
N2 1837 d 970 b 1383 cd 867 b -454 a 73.6 a
N3 1744 e 890 b 1294 d 854 b -450 a 73.6 a

Table 9

Correlation coefficient of rice eating quality characters and other qualities"

指标
Index		 外观
Appearance		 硬度
Hardness		 黏度
Viscosity		 平衡度
Balance		 食味值
Taste value
整精米率HMR 0.24 -0.22 0.28 0.25 0.25
垩白度CD -0.07 0.13 -0.06 -0.08 -0.08
直链淀粉含量AC -0.38* 0.45** -0.32 -0.37* -0.38*
胶稠度GC 0.16 -0.13 0.21 0.18 0.17
蛋白质含量PC -0.50** 0.49** -0.52** -0.51** -0.51**
清蛋白含量AlC -0.62** 0.57** -0.65** -0.62** -0.62**
球蛋白含量GlC -0.75** 0.72** -0.76** -0.75** -0.75**
醇溶蛋白含量PlC -0.60** 0.56** -0.63** -0.61** -0.60**
谷蛋白含量GlC -0.61** 0.59** -0.65** -0.62** -0.62**
峰值黏度PKV 0.14 -0.12 0.17 0.15 0.15
崩解值BDV 0.46** -0.49** 0.46** 0.47** 0.47**
消减值SBV -0.83** 0.86** -0.79** -0.82** -0.83**
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