Effects of silicon fertilizer on nitrogen utilization efficiency and nitrogen accumulation of super early rice were investigated in this study with Zhuliangyou819 (Lodging sensitive variety) and Luliangyou996 (Lodging resistant variety) as materials. The main results were showed : under the condition of both nitrogen application and without nitrogen application, nitrogen accumulation, nitrogen use efficiency, nitrogen uptake efficiency, nitrogen fertilizer efficiency and nitrogen utilization efficiency of super early rice were improved by silicon application, while nitrogen physiological efficiency was slightly decreased. The effects of silicon fertilizer application on nitrogen content in leaves, stems and panicles of two super early rice varieties were relevant with nitrogen application rate. Under the conditions of 150 kg/hm2 of nitrogen application, effects of silicon application on nitrogen utilization efficiency and nitrogen accumulation were most significant in both varieties. Therefore, combined application of nitrogen and silicon was advantageous to increase fertilizer use efficiency in super early rice production.%以超级早稻组合株两优819(倒伏敏感品种)与陆两优996(抗倒伏品种)为材料,研究了硅肥对超级早稻氮利用效率及氮累积的影响.结果表明:在不施氮和施氮条件下施硅,能使超级早稻氮素累积量、氮肥利用率、氮素吸收效率、氮肥效率及氮素利用效率提高,而氮生理效率略有降低;施硅对两个超级早稻品种叶、茎、穗含氮量的影响与施氮量有关;在施氮150kg/hm2条件下施硅,对两个超级早稻品种氮利用效率及氮累积的影响效果最大.因此,在超级早稻生产过程中,氮硅肥合理配施有利于提高肥料利用率.
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