增施氮肥对玉米植株氮积累量和器官氮含量的影响

Effect of Increased Nitrogen on Nitrogen Accumulation and Nitrogen Content in Maize

以玉米品种隆平206为试验材料,研究不同施氮量对夏玉米不同器官氮素吸收积累量、干物质积累及产量的影响,以期为夏玉米合理施肥提供理论依据。结果表明,随着氮肥施用量的增加,不同器官氮含量、氮积累量和干物质量显著提高;施氮量高于300kg/hm^2时,随着施氮量的增加,氮含量和干物质积累量不再显著增加。随着氮肥用量的增加,产量显著增加,不同处理较对照产量提高30.7%~104.3%;施肥量达225kg/hm^2后,产量无显著增加;氮肥施用量与产量存在线性加平台的关系。氮肥用量提高,氮素偏生产力显著下降,较对照下降34.7%~70.9%。

Field experiment was carried out to investigate the effects of different nitrogen application amount on the nitrogen accumulation amount of different organs,dry matter accumulation and grain yield in summer maize cultivar“Longping206”,in order to provide a theoretical basis for rational fertilization of summer maize.The results showed that with the increase of nitrogen application rate,the nitrogen content of different organs,nitrogen accumulation and dry matter accumulation increased significantly.When the nitrogen application rate was higher than 300 kg/hm^2,there was no significant differences between different nitrogen treatments in the nitrogen content and dry matter accumulation.With the increase of nitrogen fertilizer application rate,the grain yield increased significantly by 30.7%-104.3%,compared with the control,while there was no significant differences when the nitrogen application amount exceeded 225 kg/hm^2.The relationship between nitrogen application rate and yield was linear and platform.With the amount of nitrogen fertilizer increased,and the partial productivity of nitrogen decreased significantly,which was 34.7%-70.9%lower than the control.