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试验以郑单958为材料,在79500株/hm2密度下研究了前期控氮对玉米产量、物质生产及氮素利用的影响。结果表明,在大喇叭口期施氮120kg/hm2的条件下,前期按30～60kg/hm2进行适度控氮,产量可达到10108.5～10170.0kg/hm2,氮肥利用率为32.78%～33.35%。前期适当控氮保证玉米苗期对氮素的需求,达到蹲苗的效果,控上促下,培育壮苗,提高根系的吸收和合成能力。前期适度控氮还可保持植株后期较强的光合生产能力,增强根系吸氮能力,保证子粒有充足的碳氮来源,并促进干物质及氮素向子粒的运转,实现玉米产量与氮素利用的协同提高。
In the experiment, Zhengdan958 was used as the material to study the effect of nitrogen control on the yield, material production and nitrogen utilization of maize at 79500 plants / hm2 density. The results showed that under the condition of 120 kg / hm2 of big trumpet stage, moderate nitrogen control was carried out at the initial stage of 30-60 kg / hm2, the yield could reach 10108.5-10170.0 kg / hm2 and the utilization rate of nitrogen fertilizer was 32.78% -33.35%. Pre-appropriate nitrogen control to ensure corn seedling nitrogen demand, to the effect of squatting seedlings, control and promote the next, nurturing strong seedlings, improve root absorption and synthesis capacity. Moderate N control at the early stage can also maintain a strong photosynthetic capacity in the later stage of the plant, enhance the nitrogen absorption ability of the root system, ensure that the grains have sufficient sources of carbon and nitrogen, and promote the operation of dry matter and nitrogen to the grains and achieve corn yield and nitrogen utilization Synergy improved.