以早稻品种中嘉早17和中早39为材料，设置5个不同氮肥水平（纯氮0、0.8、1.6、2.4、3.2 g/盘），探讨不同氮肥水平下水稻机插秧苗素质差异及对产量的影响。结果表明，随施氮量增加，秧苗含氮量增加，但成苗率降低，氮素积累量为先增加后下降趋势，在2.4 g/盘处理达最大；不同施氮量对两品种秧苗素质的影响存在差异，适宜的施氮量有利于提高秧苗素质，以27 d秧龄的影响较大。两品种不同施氮量下水稻产量均以1.6 g/盘的处理较高，与不施氮处理相比，增幅分别达24.14%、7.73%，产量增加主要与有效穗数的增加有关。综合这2个品种秧苗素质及机插后的产量效应，确定每盘施氮量宜为1.6～2.4 g。
关键词：
早稻; 机插; 施氮量; 秧苗素质; 产量
Effects of different nitrogen level（0, 0.8, 1.6, 2.4 and 3.2 g per seedling tray）on seedling quality and grain yield of double early rice zhongjiazao17 and zhongzao39 with machine transplanted were studied. The results showed that progressively higher rates of ammonium sulfate caused a gradual increase in nitrogen content of rice seedlings, but decreased the seedling rate, and N accumulation had a tendency with increasing and then declining, and the maximum value was at N3 treatment. Effects of different N application on seedlings quality were different, the suitable N application could increase rice seedlings quality, the higher influence was obtained in 27 day age seedlings. The yield increased by 7.73% and 24.14% with 1.6 g N application per seedling dish constrast to no nitriogen treatment, which is related to its effective panicles. Considered the seedling quality and grain yield of machine transplanted rice, the N application per seedling dish was suggested from 1.6 to 2.4 g per tray.
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