2009 Fiscal Year Final Research Report
Clarification of nitrogen dynamics in paddy fields in Vietnam
| Project/Area Number |
19405024
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | Japan International Research Center for Agricultural Sciences |
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Principal Investigator |
WATANABE Takeshi Japan International Research Center for Agricultural Sciences, 生産環境領域, 主任研究員 (40425525)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 環境調和型農林水産 / 土壌学 / 環境 |
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| Research Abstract |
The nitrogen (N) losses from paddy field by ammonia volatilization were measured in 3 sites. The losses were 10.3kg ha^<-1> in average and equivalent to 11.4% of applied N fertilizer. Destinations of the applied N fertilizer were monitored at 2 sites in northern Vietnam. The gap between applied N fertilizer (94kg ha^<-1> in average) and sum of N recovered in rice plant and soil (0-25cm) and volatilized ammonia was 34.5kg ha^<-1>. It seemed that most of the gap was caused by N losses by denitrification and leaching.
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