[ Objective] To investigate the effects of mitrogen fertilizer and MET on plant types and yield characters of high grade hybrid rape. [ Method] Sanbei 98 and Youyan 599 were used as the material to carry out different nitrogen application and MET spraying stage experiment. [ Result ] Spraying MET could decrease the plant height, the effective branch height and main rachis length, conversely increased the root base diameter, the 1st branches per plant, the 2nd branches per plant, the number of siliqua per plant, the seeds per siliqua and weight of 1 000 seeds. To spray MET at the bolting stages had the best effect. The effect of 300 kg/hm2 pure nitrogen and spraying MET was better than that of applying 225 kg/hm2 pure nitrogen and spraying MET. With the application of 300 kg/hm2 pure nitrogen, the spraying of MET at bolting stage, in comparison with the spraying of water, increased the number of 1st branches by 2.08 -2.21 , the number of second branches by 1.80-2.12, the plant siliquan by 50.30 - 102.50, the siliqua seeds by 1.11 - 1.21 .respectively. [Conclusion] The high grade hybrid rape had the best plant types and yield character when applying with 300 kg/ hm2 of pure nitrogen and spraying 200 mg/kg 15% MET WP bolting stage.%[目的]为了研究氮肥及不同时期喷施多效唑对优质杂交油菜株型性状及产量性状的影响.[方法]以三北98和油研599为材料,进行不同施氮量与不同时期喷施多效唑的试验.[结果]叶面喷施多效唑能降低株高、有效分枝高度、主花序长,增加根径粗、一次和二次分枝数、单株有效角果数、角粒数和千粒重.抽薹期喷施多效唑的效果较好.施纯氮量300 kg/hm2喷施多效唑比施纯氮量225kg/hm2喷施多效唑的效果较好.施纯氮量300 kg/hm2抽薹期喷施多效唑(N20A2)比喷施清水(N20A0)一次分枝数增加2.08～2.21个,二次分枝数增加1.80～2.12个,单株有效角果数增加50.30 ～ 102.50角,角粒数增加1.11 ～1.21粒.[结论]优质杂交油菜在施纯氮量300 kg/hm2并于抽薹期喷施浓度为200 mg/kg 15％多效唑可湿性粉剂的株型及产量性状最好.
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