施用氮肥对玉米产量构成因素及其根系生长的影响

Effect of N fertilizer applicationon yield components and root system growth of maize

通过不同施氮水平对玉米产量构成因素及其根系生长影响的研究,结果表明,氮肥用量在90~270 kg/hm2,玉米产量构成因素随氮肥用量增加而提高,当氮肥用量达360 kg/hm2时玉米产量则下降。在试验土壤肥力条件下,施氮270 kg/hm2玉米产量最高,玉米根长、棒三叶叶面积、百苗干重和粗蛋白质、粗淀粉、粗脂肪含量均明显好于其它处理。

The effect of different N fertilizer levels on yield components and root system growth of maize was studied.Results showed that yield components of maize increased from 90～270 kg/hm2 N fertilizer level,and it descended in 360 kg/hm2 N fertilizer level.The yield of maize was the highest in 270 kg/hm2 N fertilizer level under the experimental conditions of soil fertility,the root lenth,LAI of the three leaves around corn cob,100-seedling dry weight and the coarse protein,corse starch,coarse oil of maize in the treatment were the best in all the treatments.