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通过9个大田试验研究了氮肥用量对甜荞麦产量、养分含量、养分累积量及氮肥利用率的影响。结果表明,施氮(N)30、60和90kg/hm2与不施氮相比平均子粒产量分别增加52.6%、83.0%和63.7%,子粒含氮量增加7.0%、10.8%和6.9%,植株地上部氮素总累积量提高66.9%、119.3%和109.5%。说明施氮能提高甜荞麦子粒产量,提高甜荞麦对氮素吸收和累积,甜荞麦氮素生理效率、氮素收获指数、氮素利用率、氮肥农学利用率、氮肥效率和氮肥生理利用率均随氮肥用量的增加而下降。综合结果表明,内蒙古通辽市库伦旗甜荞麦高产高效生产的氮肥推荐使用量为N 30～60kg/hm2。
Nine field experiments were conducted to study the effect of nitrogen fertilizer on the yield, nutrient content, nutrient accumulation and nitrogen use efficiency of sweet buckwheat. The results showed that the average grain yield increased by 52.6%, 83.0% and 63.7%, and the nitrogen content increased by 7.0%, 10.8% and 6.9%, respectively at 30, 60 and 90 kg / hm2 of nitrogen application. The total nitrogen accumulation in shoots increased by 66.9%, 119.3% and 109.5%. The results showed that application of nitrogen fertilizer could increase grain yield of sweet buckwheat, increase nitrogen absorption and accumulation of sweet buckwheat, nitrogen physiological efficiency, nitrogen harvest index, nitrogen use efficiency, nitrogen fertilizer use efficiency, nitrogen fertilizer efficiency and nitrogen fertilizer physiological utilization rate With the increase of nitrogen fertilizer and decline. The comprehensive results showed that the recommended production of nitrogen fertilizer for high yield and high yield of sweet buckwheat in Kulun Banner, Tongliao City, Inner Mongolia was N 30 ~ 60kg / hm2.