为生产中水氮高效利用提供依据,在3年定位水氮处理的基础上,于2008-2009年在大田条件下研究水氮组合对小麦叶片硝酸还原酶活性(NRA)、叶片可溶性蛋白含量及产量的影响.结果表明,在同一施氮水平上,开花期灌水显著提高NRA、可溶性蛋白含量和产量.灌1水条件下,随施氮量的增加叶片NRA、可溶性蛋白含量呈线性增长,在水分较适宜的2水灌溉条件下,叶片NR活性、可溶性蛋白含量均呈抛物线趋势,NRA在全年施氮240 kg/hm²时最高、可溶性蛋白含量在施氮480 kg/hm²最高,增加施氮量呈下降趋势.在灌2水全年施氮480 kg/hm²时产量最高,说明增加灌水有利于氮素增产效应的发挥.

Field experiment was conducted during 2008-2009,the effects of water and nitrogen on leave nitrate reductase activity(NRA),soluble protein content and yield of winter wheat Jimai 5265 were studied in order to provide the framework for reasonable irrigation and fertilization,based on a 3 years location study.The result indicated that the NRA,content of soluble protein of the flag leaves and grain yield were remakably improved by the anthesis irrigation under the same nitrogen amount.The NRA and the content of soluble protein showed an increasing trend with nitrogen amount,when it was irrigated one time in winter wheat.Under the two times irrigatation conditions with appropriate moisture content,NRA and the content of soluble protein all showed a parabola type with the highest NRA and the content of soluble protein appeared in nitrogen amount of 240 kg/hm² and 480 kg/hm²,respectively,and decreased when too much nitrogen applied.It had the highest yield when it was irrigated two times and fertilized 480 kg/ha in the whole year.The result indicated that increasing irrigation showed a good effect on nitrogen effectiveness in high-yielding wheat production.