氮肥基/追比对华北平原夏玉米生长发育与水、氮利用的影响Ⅱ.夏玉米氮素累积、转运与土壤无机氮动态[J]. 中国生态农业学报(中英文), 2008, 16(1): 86-90. DOI: 10.3724/SP.J.1011.2008.00086
引用本文: 氮肥基/追比对华北平原夏玉米生长发育与水、氮利用的影响Ⅱ.夏玉米氮素累积、转运与土壤无机氮动态[J]. 中国生态农业学报(中英文), 2008, 16(1): 86-90. DOI: 10.3724/SP.J.1011.2008.00086
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Effect of base N to dress N ratio on water and nitrogen utilization,growth of summer maize in North China Plain.Ⅱ.Nitrogen accumulation and translocation of summer maize and dynamics of soil inorganic N[J]. Chinese Journal of Eco-Agriculture, 2008, 16(1): 86-90. DOI: 10.3724/SP.J.1011.2008.00086
Citation: Effect of base N to dress N ratio on water and nitrogen utilization,growth of summer maize in North China Plain.Ⅱ.Nitrogen accumulation and translocation of summer maize and dynamics of soil inorganic N[J]. Chinese Journal of Eco-Agriculture, 2008, 16(1): 86-90. DOI: 10.3724/SP.J.1011.2008.00086
shu

氮肥基/追比对华北平原夏玉米生长发育与水、氮利用的影响Ⅱ.夏玉米氮素累积、转运与土壤无机氮动态

Effect of base N to dress N ratio on water and nitrogen utilization,growth of summer maize in North China Plain.Ⅱ.Nitrogen accumulation and translocation of summer maize and dynamics of soil inorganic N

    摘要
  • 摘要: 在较低施氮量180 kg(N) · hm-2下,以"郑单958"为材料,研究了氮肥不同基/追比(1∶ 2、1∶ 1和2∶ 1)对华北平原夏玉米氮素累积、转运与土壤无机氮动态及土壤氮素表观盈亏的影响.结果表明:施氮使夏玉米氮素累积量增大,并促进叶、茎鞘氮素向籽粒转运,但不能相应提高氮收获指数(NHI),且NHI随基施氮比重增大而降低;基施氮主要在拔节至大喇叭口期发挥作用,追施氮则主要在大喇叭口至吐丝期发挥作用,氮肥利用率随追氮比例增大而提高,N1∶ 2较N2∶ 1处理氮肥利用率提高2倍多;土壤无机氮含量因施氮而有较大幅度提高,拔节期后各土层无机氮含量一般以乳熟期为界前降后升,处理间略有差异,追肥越少此趋势越明显;不施氮处理各生育阶段土壤氮素均表现亏缺,吐丝后亏缺量占总亏缺量近80%,施氮使总亏缺量大大降低,N 1∶ 1处理氮亏缺量最小,N 1∶ 2与N2∶ 1处理相当,各施氮处理土壤氮素表观盈亏呈明显的阶段性,拔节至大喇叭口期出现大量盈余,从而使播种至吐丝期整体表现盈余,吐丝后两阶段均表现亏缺.

     

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