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	Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region
	Wang, DJ; Liu, Q; Lin, JH; Sun, RJ
刊名	ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
	2004-06-01
卷号	26期号:2-3页码:221-227
关键词	NO3--N leaching optimum nitrogen rate rice-wheat system Yangtse Delta region yield
ISSN号	0269-4042
通讯作者	Wang, DJ(djwang@issas.ac.cn)
英文摘要	A long-term field and lysimeter experiment under different amount of fertilizer-N application was conducted to explore the optimal N application rates for a high productive rice-wheat system and less N leaching loss in the Yangtse Delta region. In this region excessive applications of N fertilizer for the rice wheat production has resulted in reduced N recovery rates and environment pollution. Initial results of the field experiments showed that the optimal N application rate increased with the yield. On the two major paddy soils (Hydromorphic paddy soil and Gleyed paddy soil) of the region, the optimal N application rate was 225-270 kg N hm(-2) for rice and 180-225 kg N hm(-2) for wheat, separately. This has resulted in the highest number of effective ears and Spikelets per unit area, and hence high yield. Nitrogen leaching in the form of NO3--N occurs mainly in the wheat-growing season and in the ponding and seedling periods of the paddy field. Its concentration in the leachate increased with the N application rate in the lysimeter experiment. When the application rate reached 225 kg N hm(-2), the concentration rose to 5.4-21.3 mgN l(-1) in the leachate during the wheat-growing season. About 60% of the leachate samples determined contained NO3--N beyond the criterion (NO3--N 10 mg l(-1)) for N pollution. In the field experiment, when the N application rate was in the range of 270-315 kg hm(-2), the NO3--N concentration in the leachate during the wheat-growing season ranged from 1.9 to 11.0 mg l(-1). About 20% of the leachate samples reached close to, and 10% exceeded, the criterion for N pollution. Long-term accumulation of NO3--N from leaching will no doubt constitute a potential risk of N contamination of the groundwater in the Yangtse Delta Region.
收录类别	SCI
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Public, Environmental & Occupational Health ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Public, Environmental & Occupational Health ; Water Resources
语种	英语
出版者	KLUWER ACADEMIC PUBL
WOS记录号	WOS:000223553200014
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2559346
专题	南京土壤研究所
通讯作者	Wang, DJ
作者单位	Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Wang, DJ,Liu, Q,Lin, JH,et al. Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region[J]. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH,2004,26(2-3):221-227.
APA	Wang, DJ,Liu, Q,Lin, JH,&Sun, RJ.(2004).Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region.ENVIRONMENTAL GEOCHEMISTRY AND HEALTH,26(2-3),221-227.
MLA	Wang, DJ,et al."Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region".ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 26.2-3(2004):221-227.

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