Scientia Agricultura Sinica ›› 2022, Vol. 55 ›› Issue (8): 1546-1556.doi: 10.3864/j.issn.0578-1752.2022.08.006


Effects of Hybrid Rice on Grain Yield and Nitrogen Use Efficiency: A Meta-Analysis

LIAO Ping1(),MENG Yi1,WENG WenAn1,HUANG Shan2(),ZENG YongJun2,ZHANG HongCheng1   

  1. 1Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Jiangsu Industrial Engineering Research Center of High Quality Japonica Rice/Yangzhou University, Yangzhou 225009, Jiangsu
    2Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Agricultural University, Nanchang 330045
  • Received:2021-06-28 Accepted:2021-10-08 Online:2022-04-16 Published:2022-05-11
  • Contact: Shan HUANG;


【Objective】Hybrid rice has a higher yield potential than inbred rice, but the difference in nitrogen (N) use efficiency between hybrid rice and inbred rice remains unclear. The objective of this study was to examine the effects of hybrid rice on yield and N use efficiency through meta-analysis techniques. 【Method】The peer-reviewed articles were collected, which included inbred rice as the control in comparison with a hybrid rice treatment. In total, the dataset included 56 studies involving 367 paired observations. Then, the meta-analysis was conducted to identify the response of grain yield and N use efficiency to hybrid rice as affected by hybrid type, N rate, the number of N application, soil total N content, the ratio of soil organic carbon to N, and soil texture. 【Result】Overall, the hybrid rice significantly increased rice yield (+11%) and biomass (+14%), but did not affect harvest index compared with inbred rice. Hybrid rice could improve rice yield relative to inbred rice under various N rates. However, the increase in rice yield under hybrid rice reduced with increasing N application rates. Moreover, the hybrid rice significantly increased N uptake, N physiological efficiency, and N recovery efficiency by 8.1%, 2.9%, and 3.6 units, respectively. 【Conclusion】Hybrid rice could improve yield and N use efficiency relative to inbred rice, which provided an insight to evaluate the effect of hybrid rice on grain yield and N use efficiency in China.

Key words: hybrid rice, inbred rice, yield, N use efficiency, meta-analysis

Table 1

Overview of the hybrid rice experiments included in the meta-analysis"

N rate
Soil total
N (g·kg-1)
Soil C﹕N
Soil texture
Harvest index
N uptake
N physiological efficiency
N recovery efficiency
1 I 0/100/125 NA NA NA NA NA NA NA NA
3 I 0/150/225 NA NA H NA NA NA
4 IJ 0/200/300/400 2.09 6.9 L NA NA NA
5 I/J 143 2.00/2.50 9.8/9.0 H NA NA NA NA NA
6 I 0/200 2.18 11.3 H NA
7 IJ 200 2.02 11.1 H NA NA NA NA
8 I 0/90/180/270/ 360 1.52 5.5 L NA NA
9 IJ 0/270/300/360 1.35 10.0 L NA NA
10 I 150 2.70 9.9 NA NA NA
11 IJ 300 1.70 8.8 H NA NA
12 I 0/120/150 2.37 9.5 H
13 I 90/180 1.80 13.2 H NA
14 I 0/90 1.90/2.10 6.8/7.6 H NA
15 I/IJ 100 1.19 13.0 H NA
16 J 270 1.85 8.8 H NA
17 I 0/113/161/176/225 1.58/1.59/1.68 10.1/10.6/11.7 NA
18 J/IJ 0/60/120/180 1.26 9.6 H NA NA NA NA NA
19 I 0/120/165/210 2.40 9.0 H NA NA NA NA NA
20 I 0/150/180/225 2.40 9.0 H NA
21 I 0/135/150/225 2.40/3.30 7.5/9.0 H NA NA NA
22 J 0/150/300/450 NA NA NA NA NA NA NA NA
23 J 0/225 2.70 3.6 L NA NA NA NA NA
24 I 0/150 1.25 10.9 L NA
25 I/IJ 300 1.60 13.9 NA NA NA NA
26 I 150/300 1.12 10.9 L NA NA NA NA
27 I 0/40/80/120/ 160/200/240 2.54 10.7 L NA NA NA NA
28 I/IJ 263 1.30 10.7 L NA NA NA
29 I 0/120 1.14 19.9 L NA
30 I 0/90/180/270/ 360 1.97 5.9 NA NA NA NA
31 I 150 NA NA H NA NA
32 I 0/120/165/210 2.40 9.0 H NA NA NA
33 I 120/150 1.76 NA NA NA NA
34 I 150 1.59 9.4 L NA NA NA NA NA
N rate
Soil total
N (g·kg-1)
Soil C﹕N
Soil texture
Harvest index
N uptake
N physiological efficiency
N recovery efficiency
35 I 180 1.70 13.7 NA NA NA NA NA
36 IJ 0/150/225/300/375 1.77 14.0 NA NA NA NA
37 I 0/135/180/225 NA NA NA NA NA NA NA
38 I 200 1.59 9.4 L NA NA NA NA NA
39 I 0/90/130/170/ 210/250 2.34/2.62 7.3/8.0 L NA NA
40 I/IJ 270 1.60 13.9 L NA NA NA
41 I 0/50/100/150/ 200/250 1.49 10.0 H NA NA NA
42 I/IJ 263 1.70 9.1 H NA NA
43 I/IJ 263 1.40/1.70 9.1/10.5 L/H NA NA NA NA NA
44 I/IJ 263 1.60 10.6 NA NA NA NA NA
45 I 375 NA NA NA NA NA NA
46 I 0/150 NA NA NA NA NA NA NA NA
47 I 150/300 1.35 10.3 L NA NA NA
48 IJ 0/210 2.70/2.90 6.7/7.2 H NA NA NA NA
49 I 90/180 1.79/1.83 6.3/7.5 H NA
50 I 150/250 NA NA L/H NA NA NA NA NA
51 I 200 1.22 10.1 L NA NA NA NA
52 IJ 0/270/300 1.35 10.2 L NA NA NA
53 J/IJ 0/270/300 1.35 10.0 L NA NA NA
54 I/J 180 1.58 16.7 NA NA NA NA
55 J 0/140/180/220 1.28 14.1 L NA NA NA
56 I 150 2.20 7.7 H NA NA

Fig. 1

Effects of hybrid rice on grain yield (a), biomass (b), and harvest index (c) Numbers in the bracket indicated the number of observations/studies within each category. Error bars indicated 95% confidence intervals. The same as below"

Table 2

Effects of hybrid rice on yield, biomass, harvest index, N uptake, N physiological efficiency, and N recovery efficiency (P-values)"

Categorical variable
Rice yield
Harvest index
N uptake
N physiological efficiency
N recovery efficiency
杂交稻类型 Hybrid type <0.001 <0.001 0.474 <0.001 0.896 0.387
氮肥施用量 N rate <0.001 0.681 0.676 0.328 0.727 <0.001
氮肥施用次数 N application number 0.198 0.914 0.124 0.740 0.079 0.570
土壤全氮 Soil total N 0.296 0.760 0.700 0.982 <0.05 0.198
土壤碳氮比 Soil C﹕N <0.05 0.253 0.404 0.557 0.157 <0.001
土壤质地 Soil texture 0.873 0.288 0.137 <0.05 0.131 0.236

Fig. 2

Effects of hybrid rice on N uptake (a), N physiological efficiency (b), and N recovery efficiency (c)"

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