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【目的】以广西超级稻品种桂两优2号为材料,研究不同氮肥运筹方式对其干物质生产及氮肥利用率的影响。【方法】进行田间试验,设置3个施氮水平,分别为0(N0)、210(N1)和255(N3)kg/ha,两种施氮比例分别为基肥∶蘖肥∶穗肥=5∶3∶2(F1)和4:3:3(F2),共计5个处理(N0、F1N1、F1N2、F2N1和F2N2),测定不同处理下桂优2号干物质积累及氮肥利用率。【结果】施氮显著增加了桂两优2号不同生育期干物质积累量,且F2N1和F2N1处理在穗后干物质增加量及其对产量贡献率上均显著高于其他处理;桂两优2号各生育期吸氮量随施氮量的增加而提高,施肥方式F2更有利于桂两优2号对氮素的吸收;相同施肥条件下,F2处理的产量和氮肥偏生产力(NPFP)、氮肥农学利用率(NAE)和氮肥吸收利用率(NRE)均较F1处理有所增加,F2N2处理产量最高,但与F2N1处理差异不显著,而F2N1处理的NPFP、NAE和NRE均达到最高水平。【结论】施氮量210kg/ha(N1)、施氮比例为基肥∶蘖肥∶穗肥=4∶3∶3(F2)处理,可在晚稻实现桂两优2号高产高效,其产量达8170.2kg/ha,NPFP、NAE和NRE分别为38.9kg/kg、12.6kg/kg和41.5%。
【Objective】 The objective of this study was to investigate the effects of different N application patterns on dry matter production and nitrogen use efficiency of Guangxi Super rice variety Guiliangyou 2. 【Method】 Field experiments were conducted in which three nitrogen rates were set at 0 (N0), 210 (N1) and 255 (N3) kg / ha, respectively. The two nitrogen rates were base fertilizer: tiller fertilizer: A total of 5 treatments (N0, F1N1, F1N2, F2N1 and F2N2) were selected to determine the dry matter accumulation and nitrogen use efficiency of Guiyou No.2 under different treatment conditions: 3: 2 (F1) and 4: 3: 3 (F2) 【Result】 The results showed that nitrogen application significantly increased the dry matter accumulation at different growth stages of Guiliangyou 2, and that of F2N1 and F2N1 treatments were significantly higher than those of other treatments on the increase of dry matter and its contribution to yield The nitrogen uptake in each growth stage of No.2 increased with the increase of nitrogen application rate. Fertilization mode F2 was more conducive to the nitrogen uptake by Gui Liangyou 2; under the same fertilization, the yield of F2 treatment and the NPFP (partial nitrogen fertilization) (NAF) and NRE (NRE) of F1 were higher than those of F1, but F2N2 had the highest yield but no significant difference with that of F2N1, while NPFP, NAE and NRE of F2N1 reached the highest level . 【Conclusion】 Nitrogen application rate of 210 kg / ha (N1) and nitrogen application rate of basal fertilizer: tillering fertilizer: panicle fertilizer = 4: 3: 3 (F2) could realize high yield and high yield of Guiliangyou No.2 in late rice, 8170.2 kg / ha, NPFP, NAE and NRE were 38.9 kg / kg, 12.6 kg / kg and 41.5%, respectively.