NDLI: Study of nitrate-nitrogen leaching characteristics in the agricultural extensively planted farmland

Content Provider	IEEE Xplore Digital Library
Author	Haiying Gao Ligang Xu
Copyright Year	2011
Description	Author affiliation: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 210008, China (Ligang Xu) \|\| Department of Municipal Engineering, Southeast University, Nanjing, 210096, China (Haiying Gao)
Abstract	Nitrogen loss in farmland is one of the main reasons to bring forth agricultural non-point source pollution. Furthermore, nitrogen leaching loss causing by superfluous nitrogen from farmland is the most important approach of farmland nitrogen loss. To solve the problem of nitrogen loss under the agricultural extensively planted conditions, the laboratory experiment and field monitoring was conducted to investigate the leaching characteristics. The results showed that soil nitrate nitrogen content in three typical planting areas showed a decreased tendency with the depth of soil profile, including the maximum of soil nitrate nitrogen content appearing in the 20–40cm layer in greenhouse vine intensive planting areas. Soil nitrate concentration in the intensive planting areas did not change frequently, but change range was greater; and soil nitrate concentration in the conventional planting areas did not change frequently, but change range was greater. The average accumulation of nitrate nitrogen in the greenhouse vine intensive planting areas was the highest, which were significantly higher than that of vegetable intensive planting areas and conventional planting farmland. Monitoring results of field experiment indicated that the difference of groundwater nitrate-nitrogen content in three typical planting areas was distinct; nitrate nitrogen average content of greenhouse vine intensive planting base was the highest among three typical planting areas, being up to $11.2mg.L^{−1}.$ However, nitrate nitrogen content of vegetable intensive planting areas and conventional planting farmland were respectively $4.02mg.L^{−1}$ and $1.35mg.L^{−1}.$ It further suggested that nitrate nitrogen average content in intensive planting areas had large varied amplitude and higher over standard rate, and excessive irrigation and fertilization had caused groundwater environment pollution. The work presented in this paper is also believed to be useful in formulating management strategies for an extensively cropped farmland to reduce diffusive pollution from agricultural activities.
Starting Page	2527
Ending Page	2530
File Size	382984
Page Count	4
File Format	PDF
ISBN	9781424491728
e-ISBN	9781424491711
DOI	10.1109/RSETE.2011.5964828
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-24
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pollution Green products Soil Farmland Nitrate-nitrogen Vertical transport Conventional agriculture Nitrogen Leaching Extensively planted farmland Fertilizers
Content Type	Text
Resource Type	Article

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