Responses of Rice Growth and N Uptake to NO_3~--N Supply under Different Water Regimes

[Objective] The research aimed to study the effects of NO-3-N supply on growth and N uptake of rice cultivar Wuyujing 3 under different water regimes.[Method] Rice seedlings were solution-cultured and different water regimes were generated by using PEG6000.[Result] Under normal water condition,the maximum biomass of rice seedlings were obtained when 60 mg/L NO-3-N was supplied,but plant height of rice seedling wasn't affected by NO-3-N supply.However,under water stress all tested growth indexes of rice seedlings,including biomass,plant height,root length,root diameter,root volume,root surface area,and number of root tips,decreased with the increase of NO-3-N supply.[Conclusion] Water stress can affect the response of rice seedling growth to NO-3-N supply and reduce N uptake rate in rice plant.