1. Environmental challenges associated with needed increases in global nitrogen fixation

   • Arvin R. Mosier

   OriginalPaper Pages: 101 - 116

2. Nitrogen fertilizer use in China – Contributions to food production, impacts on the environment and best management strategies

   • Z.L. Zhu
   • D.L. Chen

   OriginalPaper Pages: 117 - 127

3. Nitrogen fertilization and nitrate pollution in groundwater in Japan: Present status and measures for sustainable agriculture

   • Kikuo Kumazawa

   OriginalPaper Pages: 129 - 137

4. Nitrogen budgets and environmental capacity in farm systems in a large-scale karst region, southern China

   • Ryusuke Hatano
   • Takuro Shinano
   • Li Zuowei

   OriginalPaper Pages: 139 - 149

5. The recent trend of agricultural nitrogen flow in Japan and improvement plans

   • Shin-ichiro Mishima

   OriginalPaper Pages: 151 - 163

6. Denitrification in shallow groundwater in a coastal agricultural area in Japan

   • H. Toda
   • Y. Mochizuki
   • H. Kawashima

   OriginalPaper Pages: 167 - 173

7. Evaluating impact of land use and N budgets on stream water quality in Hokkaido, Japan

   • Krishna Prasad Woli
   • Toshiyuki Nagumo
   • Ryusuke Hatano

   OriginalPaper Pages: 175 - 184

8. Nitrogen losses from fertilizers applied to maize, wheat and rice in the North China Plain

   • G. X. Cai
   • D. L. Chen
   • Z. L. Zhu

   OriginalPaper Pages: 187 - 195

9. Effects of deep application of urea on NO and N₂O emissions from an Andisol

   • Yasukazu Hosen
   • Kobkiet Paisancharoen
   • Haruo Tsuruta

   OriginalPaper Pages: 197 - 206

10. Influence of soil physical properties, fertiliser type and moisture tension on N₂O and NO emissions from nearly saturated Japanese upland soils

    • Iain P. McTaggart
    • Hiroko Akiyama
    • Bruce C. Ball

    OriginalPaper Pages: 207 - 217

11. Effect of chemical fertilizer form on N₂O, NO and NO₂ fluxes from Andisol field

    • Hiroko Akiyama
    • Haruo Tsuruta

    OriginalPaper Pages: 219 - 230

12. N₂O and NO emissions from a field of Chinese cabbage as influenced by band application of urea or controlled-release urea fertilizers

    • W. Cheng
    • Y. Nakajima
    • H. Tsuruta

    OriginalPaper Pages: 231 - 238

13. Nitrous oxide emissions for 6 years from a gray lowland soil cultivated with onions in Hokkaido, Japan

    • Kanako Kusa
    • Takuji Sawamoto
    • Ryusuke Hatano

    OriginalPaper Pages: 239 - 247

14. The effect of soil moisture on mineral nitrogen, soil electrical conductivity, and pH

    • Rui Zhang
    • Brian J. Wienhold

    OriginalPaper Pages: 251 - 254

15. Nitrogen mineralization in paddy soils of the Chinese Taihu Region under aerobic conditions

    • Marco Roelcke
    • Yong Han
    • Jörg Richter

    OriginalPaper Pages: 255 - 266

16. Ammonium transformation in paddy soils affected by the presence of nitrate

    • Zucong Cai

    OriginalPaper Pages: 267 - 274

17. Changes in mineral N, microbial biomass and enzyme activities in different soil depths after surface applications of dairy shed effluent and chemical fertilizer

    • M. Zaman
    • K.C. Cameron
    • K. Inubushi

    OriginalPaper Pages: 275 - 290

18. Effects of controlled-release coated urea (CRCU) on soil microbial biomass N in paddy fields examined by the ¹⁵N tracer technique

    • Kazuyuki Inubushi
    • Solomon Acquaye
    • Shigeo Komatsu

    OriginalPaper Pages: 291 - 300

19. Nitrogen dynamics in paddy field as influenced by free-air CO₂ enrichment (FACE) at three levels of nitrogen fertilization

    • Md. Mozammel Hoque
    • Kazuyuki Inubushi
    • Shingo Yabashi

    OriginalPaper Pages: 301 - 308

20. Effects of lanthanum on nitrification and ammonification in three Chinese soils

    • J.G. Zhu
    • H.Y. Chu
    • K. Yagi

    OriginalPaper Pages: 309 - 314