覆盖条件下旱地施肥对小麦旗叶生理特性及籽粒产量的影响

Effects of fertilization on wheat flag leave physiological characteristics and yield in dryland area in straw mulching condition

在陕西半湿润偏旱地区秸秆覆盖保墒条件下研究氮素施用方式对小麦后期旗叶衰老及产量的影响。结果表明,秸秆覆盖配合施肥可以提高灌浆期旗叶的叶绿素含量,延缓叶衰老,延长叶片功能期,有利于提高粒重和产量;施肥可以抑制叶绿素降解,而分次施N对抑制叶绿素的降解作用更强;施N肥延缓了旗叶蛋白质的降解,分次施N处理旗叶可溶性蛋白质含量相对较高,而且随时间降低较慢,后期追施N肥可延长叶片功能期;施N肥加速了旗叶丙二醛降解,分次施N处理丙二醛含量相对较低,丙二醛(MDA)含量随时间增高速度较慢,三次施N的丙二醛含量比两次施氮低。

It was studied the effect of different N application on flag caducity of wheat anaphase and wheat yield under straw mulch in dry area of Shaanxi province. The result shown that chlorophyll content in grouting stage is high with straw mulch. It could stave leaves caducity prolonging leaves function stage; it was propitious to improve kernel weight and yield. N Fertilization could restrain chlorophyll separation, and disparate fertilization restrain chlorophyll separation more strong. Nitrogen application in late stage could stave protein separation in flag leaves. Soluble protein in flag leaves was relatively high at disparate fertilization. Fertilization in late stage that could prolong leaves function stage; nitrogen application speed up MDA capitulation, was relative low with disparate fertilization. MDA content was lower in threetime application than twotime application.