关键词: 氮高效小麦品种, 主成分分析, 氮效率指标, 产量

Abstract: In order to study the nitrogen use efficiency of wheat and screen nitrogen-efficient wheat varieties,the principal component analysis method was used to study the 12 nitrogen efficiency indexes of 27 wheat varieties based on the 2 years experiment. The results showed that the 12 nitrogen efficiency indexes all had variation among different wheat varieties,and the coefficient of variation was 4.95%—30.91%.The cumulative contribution rate of the first three principal components extracted by principal component analysis was 86.289% in 2017,and the cumulative contribution rate of the first four principal components extracted was 91.711% in 2018,which fully reflected the nitrogen efficiency information.Combining the comprehensive scores of nitrogen efficiency of each wheat variety and grain yield,the highyield nitrogen-efficient wheat varieties were Xinong 979,Xuke 168,Zhongyu 1211,Zhengmai 113,Luomai 29,Zhoumai 28, Zhoumai 22, Zhongyu 1220, Xinmai 29 and Bainong 4199; low-yield, nitrogen-lowefficiency varieties were Zhoumai 27,Zhoumai 30,Yangao 58,Luomai 31,Xinong 511,Luomai 26,Luomai 34,Fengde Cunmai 5,Zhengpinmai 8 and Luomai 18;low-yield,nitrogen-efficient variety was Zhoumai 32;high-yield,nitrogen-low efficiency variety was Lankao 198.

Key words: Nitrogen-efficiency wheat variety, Principal component analysis, Nitrogen efficiency index, Yield