水氮互作对水稻氮吸收与利用的影响

 以迟熟中粳稻武香粳9号为材料,研究了不同水分管理方式和施氮量对水稻氮素吸收与利用的影响。结果表明,随施氮量增加,水稻吸氮量增多,稻草中氮滞留增加,营养器官氮转运率降低,氮素利用率和产谷效率下降;水分胁迫过强,则水稻吸氮量减少,氮素产谷效率下降;水分胁迫适度,则水稻氮素吸收保持不变,且可更多地调动和利用营养器官中的储存氮,提高氮素利用率和产谷效率;水与氮存在明显互作作用,水分胁迫增强,则减弱了氮肥促进水稻吸氮的作用,增强了氮肥降低水稻氮素利用率的效应。结合产量表现,提出采用适度的水分胁迫,提高水稻氮素利用率,

Interactions of Water Management and Nitrogen Fertilizer on Nitrogen Absorption and Utilization in Rice

The interactions of water management and nitrogen fertilizer on nitrogen absorption and utilization in ricewere studied using Wuxiangjing9 (Japonica) as matarials. The results showed that N uptake and the remains of N in strawincreased with increasing nitrogen, and the percentage of nitrogen transported from vegetative organs, nitrogen utilizationefficiency (NUE) and nitrogen efficiency for grain production (NEGP) decreased. Under serious water stress N uptake andNEGP decreased. However, moderate water stress have no influence on N uptake, but increased the percentage of nitrogentransported from vegetative organs, and thus increasing NUE and NEGP. There was an obvious interaction betweennitrogen fertilizer and water management. With increasing water stress, the effects of nitrogen on increasing N uptakedecreased and that on decreasing NUE intensified. The results indicate that NUE and yield can be increased and N loss canbe decreased by moderate water stress.