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以超高产水稻品种丰两优香1号为材料,在常规大田生产条件下,分析不同氮肥用量对两系杂交中籼稻产量、氮肥农学利用效率以及功能叶衰老的影响。结果表明,施氮量在0~255 kg·hm-2范围内,两系稻产量、群体质量和氮肥农学利用效率随施氮量增加而提高,以255 kg·hm-2施氮处理的产量最高(11786.4 kg·hm-2)、氮肥农学利用率最大;施氮量增加到300 kg·hm-2,产量、群体质量和氮肥农学利用率均下降。氮素营养影响水稻衰老进程,适宜施氮量(255 kg·hm-2)和较高氮肥农学利用率,能保证两系杂交中籼稻齐穗后功能叶不早衰,有利于后期植株光合能力提高和光合产物积累,使后期物质积累贡献率提高,为获得高产奠定基础。
The effect of different nitrogen rates on grain yield, agronomic efficiency of nitrogen application and senescence of functional leaves of two - line hybrid rice was analyzed under the condition of conventional field production with the super high - yielding variety Fengliangyou 1 as material. The results showed that the yield, mass quality and agronomic efficiency of two-line rice increased with the nitrogen application rate increasing from 0 to 255 kg · hm-2. The yield of two-line rice with nitrogen application of 255 kg · hm-2 The highest nitrogen use rate was 11786.4 kg · hm-2. The nitrogen utilization efficiency was the highest. The nitrogen application rate was increased to 300 kg · hm-2, and the yield, population quality and N fertilizer use efficiency decreased. The effects of nitrogen nutrition on the senescence of rice, suitable nitrogen application rate (255 kg · hm-2) and high nitrogen fertilizer agronomic efficiency could ensure that the functional leaves of two-line hybrid rice did not prematurely fall after heading, which is conducive to the increase of photosynthetic capacity And the accumulation of photosynthetic products, so that the latter contributes to the accumulation of material accumulation, laying the foundation for high yield.