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以扬麦20为材料,研究后期追氮时期对小麦花后LAI、叶绿素含量、光合物质生产与运转及产量的影响。结果表明:基本苗150×104、225×104苗·hm-2、氮肥运筹5:1:2:2(基肥:壮蘖肥:拔节肥:后期追肥)条件下孕穗期追肥处理产量高于其他处理;在基本苗225×104苗·hm-2、氮肥运筹3:1:3:3条件下剑叶露尖追肥处理产量高于其他处理。剑叶露尖、孕穗期追施氮肥可维持群体花后较高LAI和SPAD值,延缓植株剑叶、倒二叶、倒三叶叶绿素降解速率,提高开花期、花后20d和成熟期干物质积累量,增加花后干物质积累量及其对籽粒的贡献率。
The effects of topdressing nitrogen on the LAI, chlorophyll content, photosynthetic production and translocation in wheat during late maturing stage were studied by using Yangmai20 as material. The results showed that the yield of topdressing booting treatments was higher than that of other booting stages under the conditions of 150 × 104,225 × 104 seedlings · hm-2 and 5: 1: 2: 2 nitrogen fertilizer application (basal fertilizer: strong tillering fertilizer: jointing fertilizer: Treatment; topdressing 225 × 104 seedling · hm-2, nitrogen fertilizer operation 3: 1: 3: 3 top leaf topdressing fertilizer treatment yield higher than other treatments. Topdressing at the booting stage and high booting stage could maintain high LAI and SPAD after anthesis, delay the chlorophyll degradation rate of the flag leaf, the second leaf and the third leaf, increase the flowering stage, Accumulate, increase the post-anthesis dry matter accumulation and its contribution to the grain.