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通过不同穗肥运筹方式,探讨前氮后移对超级杂交稻组合淦鑫688源库特征的影响。结果表明,适量氮肥后移有利于优化群体质量、协调源库关系、增强叶片功能、延长叶片功能期、提高氮肥利用效益。抽穗后,叶面积指数和叶绿素含量随穗肥用量的增加而提高,而叶面积指数和叶绿素含量的下降速率随穗肥用量的增加而减缓。适量增施穗肥,可延长下位叶功能期,提高抽穗期茎鞘物质贮藏量、总库容量和单位叶面积承载的库容量,提高成穗率和结实率,减少籽粒库对茎鞘物质的需求量,提高植株抗倒伏能力,还能提高N素的物质生产力和稻谷生产力,提高N素吸施比和N素总积累量。对于淦鑫688而言,在施N量为175～205kg/hm2时,穗肥用量以占总施N量的40%～45%为好。
The effects of pre-nitrogen uptake on the source sink characteristics of Ganxin 688 hybrid rice were investigated by different methods of panicle flowering. The results showed that the appropriate amount of nitrogen fertilizer back migration is conducive to optimizing population quality, coordinating source and sink relations, enhancing leaf function, extending leaf functional period and increasing nitrogen use efficiency. After heading, the leaf area index and chlorophyll content increased with the increase of panicle fertilizer application, while the decline rate of leaf area index and chlorophyll content decreased with the increase of panicle fertilizer application. Appropriate amount of panicle fertilizer can prolong the functional period of lower lobe and increase the storage capacity of stem and sheath, total storage capacity and the storage capacity of leaf area per unit area at heading stage, and increase the rate of panicle formation and seed setting, Demand, improve plant lodging resistance, but also improve the N-material productivity and rice productivity, improve the N absorption ratio and total N accumulation. For Ganxin 688, when applying N amount of 175 ~ 205kg / hm2, the amount of spike fertilizer should be 40% ~ 45% of the total N content.