| 前期控氮对夏玉米产量、物质生产及氮素利用的影响 |
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| 引用本文： | 王彩彩,陶洪斌,王璞,戴明宏.前期控氮对夏玉米产量、物质生产及氮素利用的影响[J].玉米科学,2010,18(5):99-104. |
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| 作者姓名： | 王彩彩 陶洪斌 王璞 戴明宏 |
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| 作者单位： | 1. 中国农业大学农学与生物技术学院/农业部作物栽培与耕作学重点实验室,北京,100193
2. 北京市农林科学院玉米研究中心,北京,100097 |
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| 基金项目： | 国家科技支撑计划项目(2006BAD02A13-2-1)、玉米行业科技项目(nyhyzx07-003-OX) |
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| 摘 要： | 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。
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| 关 键 词： | 玉米 氮肥 源库关系 氮素利用 |
| 收稿时间： | 2009/7/30 0:00:00 |
Grain Yield, Dry Matter Productivity and Nitrogen Use Efficiency of Summer Maize under Reduced N Supply at Earlier Stage |
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| WANG Cai-cai,TAO Hong-bin,WANG Pu,DAI Ming-hong.Grain Yield, Dry Matter Productivity and Nitrogen Use Efficiency of Summer Maize under Reduced N Supply at Earlier Stage[J].Journal of Maize Sciences,2010,18(5):99-104. |
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| Authors: | WANG Cai-cai TAO Hong-bin WANG Pu DAI Ming-hong |
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| Abstract: | Reducing N supply at early stage(3-leaf stage) was studied under a relatively higher planting density (79 500 plants/ha) in this experiment. Research objective was to investigate the effect of reduced N supply at 3-leaf stage on yield, dry matter productivity and nitrogen use efficiency of summer maize(Zea mays L.) hybrid Zhengdan958. Five treatments were included, zero N supply during entire growing period(CK), and other 4 N supply rates at 3-leaf stage plus 120 kg/ha N at 12-leaf stage. The results showed that grain yield and NUE were 10 108.5 - 10 170.0 kg/ha respective 32.78% - 33.35%. Reduced N supply at 3-leaf stage was sufficient for plant demand, which also simultaneously benefited for producing strong seedling. Moreover, reduced N supply at 3-leaf stage could maintain a reasonable source-sink relation by keeping strong productivity in late growth period and improving nitrogen uptake capacity of roots and then ensure adequate carbon and nitrogen to grain. |
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