氮素施用对超高产小麦生育后期光合特性及产量的影响

Effects of Nitrogen Application on Photosynthetic Characteristics and Yield of Super-high-yielding Wheat in The Late Growing and Developing Period

在施纯氮总量 2 70 .0 kg.hm- 2 条件下 ,研究了不同氮素运筹对超高产小麦生育后期光合特性及产量的影响。结果表明 ,适当推迟追氮时期与加大追氮比例 ,可提高旗叶 Ru BPcase活性与 Pn速率 ;以拔节期追氮基追比 5∶ 5处理产量构成三因素较协调 ,产量最高 ;孕穗期追氮基追比 5∶ 5与 7∶ 3二处理因千粒重与穗粒数明显增加 ,返青期追氮基追比 3∶ 7处理因穗数较多 ,增产效果均较为显著。

Effects of different nitrogen application on photosynthetic characteristics and yield of Super High Yielding wheat were studied under the conditions of total nitrogen application 270 kg.hm -2 . The results indicated that suitably postponing nitrogen application stages and improving the proportions of nitrogen application increased RuBPcase activity and Pn rates of the wheat flag leaves in wheit growing and developing period. 5∶5 proportions of nitrogen application at sowing and jointing stage(A 2B 2) had reasonable yielding components that resulted in the highest yields. Because 5∶5 and 7∶3 proportions of nitrogen application at sowing and booting stage significantly raised the 1000 kernel weight and kernel number per ear, 3∶7 proportions of nitrogen application at sowing and returning green stage had more ear formation numbers, they all had a better effect of increasing yield.