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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。
The effects of different N application strategies on the photosynthetic characteristics and yield of super-high-yielding wheat at late growth stage were studied under the condition of applying total N 2 70.0 kg · hm-2. The results showed that the appropriate postponing period of nitrogen and increasing the proportion of nitrogen can improve the activity and Pn rate of flag leaf RuBPcase; the jointing rate of topdressing nitrogen and chasing than the 5: 5 is three factors, the highest yield; the booting stage Nitrogen-based chase ratio of 5: 5 and 7: 3 two treatment due to grain weight and spikelets significantly increased the number of topdressing Nitrogen Chaiying 7: 7 treatment more because of the spike, the yield was more significant.