Clarification of nitrogen dynamics in paddy fields in Vietnam

Research Project

Project/Area Number	19405024
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	海外学術
Research Field	Plant nutrition/Soil science
Research Institution	Japan International Research Center for Agricultural Sciences
Principal Investigator	WATANABE Takeshi Japan International Research Center for Agricultural Sciences, 生産環境領域, 主任研究員 (40425525)
Project Period (FY)	2007 – 2009
Project Status	Completed (Fiscal Year 2009)
Budget Amount *help	¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000) Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000) Fiscal Year 2008: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000) Fiscal Year 2007: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords	環境調和型農林水産 / 土壌学 / 環境
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.

Report

(4 results)