• ISSN 1008-505X
  • CN 11-3996/S
巨晓棠, 潘家荣, 刘学军, 张福锁. 北京郊区冬小麦/夏玉米轮作体系中氮肥去向研究[J]. 植物营养与肥料学报, 2003, 9(3): 264-270. DOI: 10.11674/zwyf.2003.0302
引用本文: 巨晓棠, 潘家荣, 刘学军, 张福锁. 北京郊区冬小麦/夏玉米轮作体系中氮肥去向研究[J]. 植物营养与肥料学报, 2003, 9(3): 264-270. DOI: 10.11674/zwyf.2003.0302
JU Xiao-tang, PAN Jia-rong, LIU Xue-jun, ZHANG Fu-suo. Study on the fate of nitrogen fertilizer in winter wheat/summer maize rotation system in Beijing suburban[J]. Journal of Plant Nutrition and Fertilizers, 2003, 9(3): 264-270. DOI: 10.11674/zwyf.2003.0302
Citation: JU Xiao-tang, PAN Jia-rong, LIU Xue-jun, ZHANG Fu-suo. Study on the fate of nitrogen fertilizer in winter wheat/summer maize rotation system in Beijing suburban[J]. Journal of Plant Nutrition and Fertilizers, 2003, 9(3): 264-270. DOI: 10.11674/zwyf.2003.0302

北京郊区冬小麦/夏玉米轮作体系中氮肥去向研究

Study on the fate of nitrogen fertilizer in winter wheat/summer maize rotation system in Beijing suburban

  • 摘要: 采用田间微区15N示踪试验研究了肥料氮在冬小麦、夏玉米当季和后茬的去向。结果表明 ,在供试土壤的肥力水平和生产条件下 ,N 120kg/hm2 的施肥水平已经达到了较高产量 ,再增加氮肥施用量作物产量不再增加 ;其氮肥利用率和残留率均显著高于施氮量为N 360kg/hm2,损失率则远低于后者 ;在一季作物生长后仍有 20.9%~48.4%肥料氮残留于 0~100cm土层 ,这些残留的肥料氮在后茬的利用率不足 8% ,至施肥后第 2或第 3茬作物 ,仍有部分肥料氮残留于土壤。在低施氮量时 ,肥料氮以NO3--N残留的量很低 ,在高施氮量时 ,残留氮除以有机态、微生物态氮形式存在外 ,以NO3--N形式存在的比例也很高 ;在氮素损失途径中 ,淋洗损失可能占有相当重要的地位。

     

    Abstract: The fate of nitrogen fertilizer in current crop and succession crops in winter wheat and summer maize rotation system were studied using field 15N micro-plot. The results showed that crop yield would not increase when nitrogen application rate was above N 120kg /hm2. The recovery rate and residual rate of N 120 kg /hm2 were much higher than those of N 360 kg /hm2, but losses rate of N 120 kg /hm2 was much lower than that of N 360 kg /hm2. The residual rate in 0-100cm was 20.9%-48.4% after current crop harvest, the recovery rate of residual nitrogen fertilizer was less than 8%. There still had some residue nitrogen fertilizer after second or third crop harvest; the residual nitrogen fertilizer had much proportion of NO3--N with high application rate. Nitrogen leaching may play an important role in nitrogen losses.

     

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