玉米氮肥单因素不同施用量试验初报

为了准确掌握玉米氮肥单因子的最佳经济施用量,2009年在湖南省新化县进行了氮单因子6水平玉米田间肥效试验。结果表明：施用氮肥均对玉米有显著的增产作用,增产幅度达6．1％～12．0％;玉米产量随着用氮量的增加逐渐递增。但产量增幅逐步减小。当施N量为20kg／667m2时,均达最大值。

Primary Experiments of Different Application Rates of Nitrogen Fertilizer to Maize

In order to find out the optimal economic application rate of nitrogen (N) fertilizer to maize, field fertilizer efficiency experiments of single factor. (N fertilizer) with six application rates to maize was conducted in Xinhua County.The results showed that the applications of N fertilizer increased maize yield by 6.1% to 12.0%; maize yield increased with increasing application rate of N fertilizer, but the increase amplitude decreased gradually. The maize yield amount reached the biggest when apphcation rate of N fertilizer was 300 kg/hm~2.