分期追施氮素对大豆生长及产量的影响

Effect of No-continuous N Supplying on Soybean Development and Yield

采用氮肥不同分期使用,研究氮对大豆生长及产量的影响,探讨大豆生产中氮的合理施用措施。结果表明:氮肥全部基施(A处理)与部分追施,并结合氮肥分期施用对大豆生长及产量有不同的影响,氮肥全部基施能促进苗期大豆生长,而氮肥的分期施用则促进了初花期之后大豆植株的生长,尤其是D处理(基肥氮肥+花期追施氮肥+鼓粒期追施氮肥),显著促进了大豆单株荚数、单株粒数、单株粒重、百粒重以及产量的增加;追施氮肥的方式中,叶面喷施效果好于土壤追施。

In order to determine a rational nitrogen application way during soybean production,the effect of nitrogen application way in different soybean growth stages on soybean development and yield were investi- gated.The results showed that there were different on soybean development and yield between basal applica- tion of nitrogen fertilizer and basal application combined with topdressing nitrogen.Basal application of all nitrogen fertilizer could promote the soybean growth.While no-continuous N supplying boosted plant develop- ment, especially D treatment which markedly boosted the number of pods and seeds per soybean plant, grain weight per plant,hundred-grain weight and soybean yield.Among topdressing ways of nitrogen fertiliz- er,the effect of leaf spray application on soybean was better than that of soil topdressing.