氮素调控对寒地玉米氮素积累及产量的影响

通过田间小区试验,研究了不同施氮量及施氮时期对寒地玉米氮素积累及产量的影响。结果表明,不同追肥时期对玉米产量有不同程度的影响,施氮时期以10叶期追肥产量最高,10叶期追肥8叶期追肥12叶期追肥14叶期追肥,10叶期追肥、8叶期追肥与12叶期追肥、14叶期追肥差异显著。10叶期追肥比12叶期追肥增产7.3%,比14叶期追肥期增产9.1%。玉米随生育期的进行,抽雄期后,植株体内氮素由营养器官向生殖器官转移,并且处理150kg·hm-210叶期追肥增产效果明显。与产量规律相一致,施氮量对玉米全株氮素积累影响不显著,10叶期追肥能显著提高玉米抽雄期后全株氮素的积累。结果表明,寒地玉米抽雄期叶片氮素积累量达1.55g·株-1时可获最大产量。

Effect of nitrogen managing on nitrogen accumulation and yield of corn in cold area

The experiments for nitrogen nutrient management in maize in cold area were carried out with the methods of field plots. The results showed that maize plants and and nitrogen accumulation in vivo is similar to fertilizer. Fertilization rate had little impact on this experiment for yield. The best dressing time was the ten leaf-stage period. and 10 leaf-age > 8 leaf-age > 12 leaf-age >14 leaf-age, 10 leaf-age, 8 leaf-age and 12 leaf-age, 14 leaf-age were different significantly. It increased production by 7.3% than 12 leaf-age stage, than 14 leaf-age by 9.1%. With the growing period for corn, after tasselling period in the plant body nitrogen transfer from vegetative organs to reproductive organs, and the highest productionvalues were in treatment 150 kg·hm-2. 10 leaves top-dressing can significantly increase nitrogen accumula-tion of corn after tasselling period. With sample of the production rule, nitrogen application rate had on effect on nitrogen accumulation of corn. We also got the plant will receive the maximum yield when corn leaf nitrogen accumulation amounted to 1.55 g·plant-1 in tasselling period of cold in area.