分期追施氮素对大豆生长及产量的影响

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。

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

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.