灌水对强筋小麦氮素代谢及产量的影响（摘要）（英文）

目的]为强筋小麦高产优质栽培的田间水分管理提供参考依据。方法]在大田条件下,设3个灌水处理水平：即全生育期不灌水（W0）,拔节期灌1水（W1）,拔节期＋孕穗期灌2水（W2）,每次灌水定额为600 m3/hm2,研究灌水次数对强筋小麦郑麦9023氮代谢及产量的影响。叶绿素（Chl）含量用分光光度计进行测定并计算,然后转化为干重表示方法;全氮（N）含量测定采用凯氏定氮法;硝酸还原酶（NR）活性测定采用活体法;蛋白质积累动态先测定籽粒氮含量,然后转化为蛋白质含量。结果]增加灌水次数能够提高旗叶NR活性、叶绿素和氮素含量,在灌浆盛期灌水处理具有明显优势。籽粒蛋白质含量随灌浆进程呈V形变化,随灌水次数增加,蛋白质含量降低,在灌浆中前期不同处理间差异较大,而在灌浆后期差异变小。籽粒产量随灌水次数增多而增加,而籽粒蛋白质含量却降低,籽粒蛋白质产量与籽粒产量表现相同趋势。结论]适当增加灌水次数,降低了籽粒蛋白质含量,但有利于提高籽粒产量和单位面积蛋白质产量。

Effects of Irrigation on Nitrogen Metabolism and Yield of Strong Gluten Wheat

Objective] The aim was to provide reference for the field irrigation management of high yield and quality cultivation of strong gluten wheat.Method]Under field conditions,the effects of irrigation times on nitrogen metabolism and yield of strong gluten wheat cultivar zhengmai 9023 were studied.Result]The results indicated that NR activity,Chlorophyll and nitrogen content in flag leaf increased with irrigation times,and the irrigation treatment had obvious advantages during middle filling stage.Grain protein content showed ＂V＂ type change with grain filling going on,and protein content decreased when irrigation times going on.There was significant difference among treatments during early stage of grain filling,and the difference became smaller in the late grain filling stage.The grain yield and protein yield increased but the protein content decreased with increasing of irrigation times.Conclusion] Increasing irrigation times properly could improve grain yield and protein yield per unit area,but reduce the grain protein content.