Classification and Evaluation on Different Rice Genotypes with Nitrogen Use Efficiency

Seventy-six rice genotypes recently applied in northern China were used as materials and field experiment was conducted to classify and evaluate rice genotypes with different nitrogen use efficiency(NUE). The results showed that there was significant difference of yield among different rice genotypes at two N levels. Based on grain yield variation under two nitrogen levels, 22 rice genotypes including Liaoyan No.2, Jijing 803, Liaoxing No.1 et al had N use efficiency and 27 rice genotypes including Tong 35, Shendao 12, Changbai 15 et al had low N use efficiency. Correlation between yield and yield components showed that yield were positively correlated with effective panicle number at 0.01 level under two N levels, and with grain number per panicle at 0.05 level under high N level. N agronomic efficiency and Partial factor productivity of applied N of rice genotypes with high N use efficiency were higher than those of rice genotypes with low N use efficiency.