The Interactions of water management and nitrogen application on photosynthetic character and kernel yield and nitrogen use efficiency and water use efficiency in the high-yielding conditions were studied. The results showed that:(1) In the same irrigation rate, the photosynthetic rate, sucrose-phosphate synthase (SPS) activity and sucrose content in flag leaf and kernel yield increased, but kernel weight, nitrogen (N) harvest index and N apparent recovery rate decreased as the nitrogen application rate increased. (2) In the same nitrogen application rate, the photosynthetic rate, SPS activity and sucrose content in flag leaf of Wl, W2 and W3 showed no significant difference during 0 ～ 14 d after anthesis; but which of W3 were higher than Wl and W2 significantly 21 days after anthesis. The kernel weight of Wl and W2 had no significant difference, but all higher than W3. (3) In NO and N1 levels, the yield of W3 were higher than Wl and W2, but it was quite the contrary under N2 level; the N apparent recovery rate and N productive efficien-cy of different treatments presented as: WO < W1, W2 < W3; while water-use efficiency of different treatments were pre-sented as; W3 < W2 < Wl < WO. In this experiment, with water irrigated at pre-sowing, jointing and ahthesis, and 210 kg/hm~2 nitrogen applied, the yield, water use efficiency and nitrogen use efficiency were higher.%在高产条件下,研究了水氮互作对小麦旗叶光合特性、籽粒产量及水分和氮素利用率的影响.结果表明:(1)同一灌水处理下,旗叶光合速率、蔗糖磷酸合成酶活性、蔗糖含量和籽粒产量均随施氮水平的增加而提高,千粒重、氮素收获指数和氮素表观利用率随施氮水平的提高而降低.(2)同一施氮水平下,W1(底墒水+拔节水+开花水)、W2(底墒水+冬水+拔节水+开花水)和W3(底墒水+冬水+拔节水+开花水+灌浆水)处理的旗叶光合速率、蔗糖磷酸合成酶活性和蔗糖含量在开花后0～14 d无显著差异;开花21 d后,W3处理显著高于W1和W2处理.(3)在N0(不施氮)和N1(180 kg/hm~2)水平下,W1和W2处理的籽粒产量显著低于W3处理,在N2(240 kg/hm~2)水平下则反之;氮素表观利用率和氮素生产效率为W0展开▼
