Management of nitrogen fertilizer application rates based on soil nitrogen fertility with the goal of lowering nitrate nitrogen concentrations in Sudangrass(Sorghum sudanense(Piper) Stapf)

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High levels of nitrate nitrogen (NO_3-N) in forage crops can poison ruminants. To promote stable production of Sudangrass (Sorghum sudanense (Piper) Stapf) with safe NO_3-N levels, we investigated the influence of soil nitrogen (N) on Sudangrass yield and on NO_3-N concentrations, and we propose a fertilizer management strategy based on soil N levels for a regime based on the application of cattle manure composted with sawdust. We used the available N content determined by incubation of fresh soil as an indicator of soil N. Both the yield and NO_3-N concentration of Sudangrass increased with increasing available N. The NO_3-N concentrations in the first grass harvest remained lower than 2gkg^<-1> (dry-matter basis), which represents the critical level to avoid nitrate poisoning of ruminants in Japan, with an available N content of 40mgkg^<-1> (dry-soil basis), the level where yield remained approximately stable without additional N fertilizer. The NO_3-N concentration increased linearly with increasing available N and exceeded the critical level when available N exceeded 50mgkg^<-1>. Under low levels of N (less than 30mgkg^<-1>), the target yields for the first grass harvest, with safe levels of NO_3-N, could be obtained with the application of 10g NM^<-2> in fertilizer, lower than the recommended rate of 15gNm^<-2>. The NO_3-N concentration was higher in the second grass harvest under the same levels of soil N with an available N of 40mgkg^<-1> or more. The NO_3-N concentrations in the second harvest exceeded the critical level when the available N was 40mgkg^<-1>. These results indicate that available N content is an effective indicator for the stable production of Sudangrass with acceptably low NO_3-N concentrations.

収録刊行物

  • Soil science and plant nutrition

    Soil science and plant nutrition 54(4), 543-554, 2008-08-01

    一般社団法人日本土壌肥料学会

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各種コード

  • NII論文ID(NAID)
    110007326961
  • NII書誌ID(NCID)
    AA00844314
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00380768
  • NDL 記事登録ID
    9590358
  • NDL 雑誌分類
    ZR7(科学技術--農林水産--農産)
  • NDL 請求記号
    Z53-G349
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS 
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