不同灌溉模式下氮肥水平对水稻氮素利用效率、产量及其品质的影响

以水稻品种两优培九为材料，研究了大田条件不同灌溉模式下氮肥水平对水稻氮素利用效率及稻米产量和品质的影响。结果表明，干湿交替灌溉（W2）和厢沟灌溉（W3）条件下水稻氮素积累总量、氮素吸收利用率分别比常规灌溉（W1）增加了18.5%、94.6％和22.1％、62.4％；产量分别增加了2.5％和9.1％。中等氮肥（N 180 kg/hm2, F2）处理的水稻氮素农学利用率和吸收利用率分别比低肥（N 90 kg/hm2, F1）处理增加了73.9％和36.2％；产量比不施肥处理（F0）增加了48.9％。水氮互作效应对稻米垩白粒率和蛋白质含量产生显著影响。

Effects of nitrogen application on nitrogen use efficiency,grain yields and qualities of rice under different water regimes

Effects of nitrogen application on nitrogen use efficiency, yields and qualities of rice under different water regimes were studied using a rice cultivar, Liangyoupeijiu, in a field study. The cultivar was grown under traditional flooding (W1), alternate wetting and drying irrigation (W2), and raised-bed irrigation (W3) at four N rates (N 0-270 kg/hm² in 90 kg increments, expressed as F0, F1, F2 and F3). Compare to W1, total nitrogen accumulation (TNA) and nitrogen recovery efficiency (NRE) under W2 and W3 are increased by 18.5%, 94.6％ and 22.1％, 62.4％, respectively, and rice yields are increased by 2.5％ and 9.1％. Compared to F1 fertilizer (N 90 kg/hm²) treatment, nitrogen agronomic efficiency (NAE) and nitrogen recovery efficiency(NRE) of the F2 (N 180 kg/hm²) treatment are increased by 73.9％ and 36.2％, and the average yield of F2 is increased by 48.9% than F0 treatment. The above results indicate there are significant effects of interaction between water and nitrogen on rice chalky percentage and protein content.