前期控氮对夏玉米产量、物质生产及氮素利用的影响  

Grain Yield,Dry Matter Productivity and Nitrogen Use Efficiency of Summer Maize under Reduced N Supply at Earlier Stage

作　　者：王彩彩[1] 陶洪斌[1] 王璞[1] 戴明宏[2] 

机构地区：[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

出　　处：《玉米科学》2010年第5期99-104,共6页Journal of Maize Sciences

基　　金：国家科技支撑计划项目(2006BAD02A13-2-1);玉米行业科技项目(nyhyzx07-003-OX)

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。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 gra...

关 键 词：玉米 氮肥 源库关系 氮素利用 

分 类 号：S51[农业科学—作物学]