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以超级杂交稻两优培九、Y两优1号、Y两优2号和Y两优900及超高产杂交稻苗头品种超优千号为材料,研究了施氮量(0,210,300,390 kg/hm~2)对不同时期超级杂交稻产量和氮肥利用率的影响。结果表明,超优千号和Y两优2号产量较高,其后依次为Y两优900、Y两优1号和两优培九。不同氮肥水平下,两优培九和Y两优1号的产量随施氮量增加呈现先增加后降低趋势,均在施氮量300 kg/hm~2下达到最高;其余品种的产量则随施氮量增加而增加,但施氮量390 kg/hm~2处理与300 kg/hm~2处理产量差异不显著。各品种氮肥利用率均随施氮量增加而降低,在施氮量300 kg/hm~2处理下达到了高产高效的平衡。较高的干物质积累和收获指数是高产的主要因素;在大量颖花数基础上,保持高结实率是超级杂交稻进一步增产的重要途径。
The effects of nitrogen application rates (0,210,300,390 kg / hm ~ 2) on super hybrid rice, Liangyoupeijiu, Y Liangyou 1, Y Liangyou 2, Y Liangyou 900 and super high yield hybrid rice, Effect of Super Hybrid Rice Yield and Nitrogen Use Efficiency in Different Periods. The results showed that the yield of Super Excellent 1000 and Y Liangyou 2 were higher, followed by Y Liangyou 900, Y Liangyou 1 and Liangyou Peijiu. Under different levels of nitrogen fertilizer, the yield of Liangyoupeijiu and Yliangyou 1 increased at first and then decreased with the increase of nitrogen application rate, and reached the maximum under the nitrogen application rate of 300 kg / hm ~ 2. The yield of other varieties increased with the increase of nitrogen application rate But no significant difference was found between the yield of 390 kg / hm ~ 2 and 300 kg / hm ~ 2. The nitrogen use efficiency of all cultivars decreased with the increase of nitrogen application rates. Under the condition of nitrogen application rate of 300 kg / hm ~ 2, high yield and high efficiency were achieved. Higher dry matter accumulation and harvest index are the main factors of high yield. Maintaining high seed setting rate is an important way to further increase yield of super hybrid rice on the basis of a large number of spikelets.