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在本试验生产条件下和施氮量范围内 ,具有 90 0 0 kg/ hm2产量潜力的品种鲁麦 2 2与 75 0 0 kg/ hm2产量潜力的鲁麦 14相比较 ,鲁麦 2 2品种随着施氮量的增加 ,开花后旗叶光合速率高值持续期长 ,旗叶磷酸蔗糖合成酶 (SPS)活性和籽粒腺苷二磷酸葡萄糖焦磷酸化酶 (ADPG- PPase)活性高 ,标记旗叶的 1 4C同化物滞留在标记叶中的比例少、向籽粒分配的比例大 ,籽粒产量高。利用 1 5N同位素的研究结果表明 ,鲁麦 2 2品种的较高施氮量处理对肥料氮的利用率高。研究认为 ,2 10～ 2 70 kg N/ hm2为黄淮冬麦区小麦由高产 (75 0 0 kg/ hm2 )向超高产 (90 0 0 kg/ hm2 )过渡并可获得 90 0 0kg/ hm2产量的高产高效施氮量。
Under the experimental conditions and in the range of nitrogen application, compared with Lumai 14 with a yield potential of 90 0 0 kg / hm2 and Lumai 14 with a yield potential of 75 0 0 0 kg / hm2, Lumai 2 2 With the increase of nitrogen application rate, the photosynthetic rate of flag leaf continued to be longer after flowering, the activity of flag leaf sucrose synthase (SPS) and the activity of grain ADPG-PPase were higher, The 1 4C assimilates of leaves retained less in the labeled leaves, distributed more to the grains and had higher grain yield. The results of using 15N isotopes show that high nitrogen application rate of Lumai 2 2 has a high utilization rate of nitrogen fertilizer. According to the research, 2 10-2 70 kg N / hm2 is the high yield of wheat with yield of 900 kg / hm2 from high yield (90 000 kg / hm2) to high yield (75 000 kg / hm2) Efficient nitrogen application.