关键词: 小麦, 氮素利用效率, 品种差异, 相关分析, 遗传率

Abstract: In order to study the genetic difference of nitrogen contents of grain， leaf and stem and nitrogen utilization efficiency(NUE) among wheat varieties，the randomized blocks experiments were made for 29 wheat varieties in the normal and the fertilizer and water deficiency environments，respectively. The results showed that the difference of nitrogen contents of grain， leaf and stem and nitrogen utilization efficiency among varieties were highly significant; the difference of nitrogen contents of leaf and stem and nitrogen utilization efficiency among environments were highly significant; the difference of nitrogen contents of grain among environments were not significant; variety×environment interaction of nitrogen contents of leaf were highly significant; nitrogen utilization efficiency of all varieties was higher in the fertilizer and water deficiency condition than normal environment condition; 5 and 4 varieties that nitrogen utilization efficiency were higher were selected in the normal and the fertilizer and water deficiency environment conditions. Correlation of nitrogen contents of grain and leaf and nitrogen utilization efficiency was highly significant under two environment conditions. The plot heritability ratio of nitrogen contents of grain， leaf and stem and nitrogen utilization efficiency were 48.4%， 7.6%， 17.4% and 35.4%; and their variety heritability ratio were 84.9％， 89.1%， 55.8% and 76.7%. It is thus clear that genetic improving nitrogen utilization efficiency of varieties and breeding high-production，good-quality and high-efficiency utilization nitrogen new wheat varieties are possible.

Key words: Wheat, Nitrogen utilization efficiency, Genetic difference, orrelation analysis, Heritability