上海青氮肥追施减量增效试验

Experiment on Reducing Top-dressed Nitrogen Fertilizer and Increasing Efficiency of Shanghaiqing

为研究追肥减氮对上海青生长和土壤理化性状的影响,设置空白对照、常规施肥、追肥减氮10%、追肥减氮15%、追肥减氮20%、追肥减氮25%、追肥减氮30%7个处理。试验结果表明,追肥减氮25%时,上海青鲜质量和品质指标显著高于对照和其他处理;土壤和植株氮、磷、钾等有效养分含量显著高于对照和其他处理,说明在一定范围内,随着氮肥施用量的降低,其利用率反而增加,因此在栽培过程中合理施用氮肥能够有效提高肥料利用率。

In order to study the effects of reducing top-dressed nitrogen fertilizer on the growth of Shanghaiqing and the physical and chemical properties of soil,seven treatments were set,including blank control,conventional fertilization,top-dressed nitrogen reduction by 10%,top-dressed nitrogen reduction by 15%,top-dressed nitrogen reduction by 20%,top-dressed nitrogen reduction by 25%,top-dressed nitrogen reduction by 30%.The results showed that when the nitrogen fertilizer was reduced by 25%,the fresh weight and quality index of Shanghaiqing were significantly higher than those of the control and other treatments.The effective nutrients content of soil and plants such as nitrogen,phosphorus and potassium were significantly higher than those of the control and other treatments.It showed that in a certain range,the utilization rate increased with the decrease of nitrogen fertilizer application,so the rational application of nitrogen fertilizer in the cultivation process could effectively improve the fertilizer utilization rate.