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为探究蓉18A系列杂交水稻品种的氮肥利用特性,选用4个蓉18A代表性品种蓉18优188、蓉18优198、蓉18优662、蓉优908,以Ⅱ优838、冈优725为对照,采用裂区设计,设置4个氮肥梯度,研究不同氮肥用量对产量及产量因素的影响。结果表明,氮肥增产的主要原因是促进有效穗的显著增加,单位施氮量的增产幅度均随施氮水平的增加而递减,在低氮水平下,蓉18A系列品种的氮肥利用率较高,具有明显的低氮高效特性。
In order to explore the characteristics of nitrogen use efficiency of Rong 18A hybrid rice varieties, 4 representative cultivars of Rong 18 18, Rong 18 18, Rong 66, Rongyou 908, Ⅱ You 838 and Gangyou 725 were selected as control , Split zone design was used to set up four nitrogen fertilizer gradients to study the effects of different nitrogen fertilizer rates on yield and yield factors. The results showed that the main reason for the increase of nitrogen fertilizer was to promote the significant increase of effective panicle, and the increase rate of nitrogen application rate per unit area decreased with the increase of nitrogen application rate. Under the low nitrogen level, the nitrogen utilization rate of Rong 18A series was higher, Has obvious low nitrogen efficient characteristics.