不同氮肥运筹对小麦产量及氮肥利用率的影响

在山东褐土传统农业种植区,研究不同氮肥运筹对小麦增产效益及氮素利用率的影响。结果表明,在施氮量相等条件下,以氮肥分3次均施增产效果最好,施肥比例为1∶3∶2的处理增产效果次之,氮肥不做基施、只追施两次的处理小麦产量最低。从产值和纯收益分析结果可见,施氮量为180 kg/hm2分3次均施处理的最高,其次为施氮量120 kg/hm2分3次均施处理,不施氮肥处理的产值和纯收益最低。分析各施氮处理的氮肥利用率可知,氮肥分3次施用高于氮肥分2次施用的处理,施用比例为1∶1∶1的处理高于施用比例为1∶3∶2的处理。

Effects of Different Nitrogen Application Techniques on Yield and Nitrogen Use Efficiency of Winter Wheat

The yield and nitrogen(N) use efficiency of winter wheat with different N application techniques were studied in Shandong cinnamon soil areas.The results were as follows.With the equal N application rate,the yield increasing effect was the best when N was applied in three equal installments,it was followed by the treatment with the application ratio of 1∶3∶2;the treatment of only dressing for twice without base application had the lowest effect.The output value and net income demonstrated that the treatment of 180 kg/hm2 N in three equal installments had the best effect;next was the treatment of 120 kg/hm2 in three equal installments;the treatment of no N application was the lowest.The N use efficiency when applied in three installments was higher than that in two installments,and that the treatment with the application ratio of 1∶1∶1 was higher than that with the ratio of 1∶3∶2.