Basic Structure of nitrogen budjet in root zone

2014 Fiscal Year Final Research Report

• Project/Area Number: 23380137
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Rural environmental engineering/Planning
• Research Institution: The University of Tokyo
• Principal Investigator: SHIOZAWA Sho 東京大学, 農学生命科学研究科, 教授 (80134154)
• Co-Investigator(Kenkyū-buntansha): YOSHIDA Shyuithiro 東京大学, 農学生命科学研究科, 準教授 (90355595) ; NISHIDA Kazuriro 東京大学, 農学生命科学研究科, 助教 (90554494)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 窒素収支 / 降雨浸透 / 根圏 / 脱窒 / 硝酸汚染

Outline of Final Research Achievements

Nitrogen (N) concentration in soil water and N-flux from root zone to groundwater has been measured in four experimental plots of different fertilizer application (organic, standard chemical, half chemical, and no fertilizer) and natural grass field with no fertilizer and no harvesting. N-budget in zoot zones was also obtained. As the results, N-flux to groundwater was 10-25% of fertilizer input, but consumption of stored nitrogen continued, which exceeded the N-leaching, even after 10 years of constant fertilizer application. On the other hand, in the grassland denitrification is almost equal to N-input from atmosphere.

Free Research Field

農地環境工学