| Effect of nitrification inhibitor DMPP on nitrogen leaching, nitrifying organisms, and enzyme activities in a rice-oilseed rape cropping system. | |
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MedLine Citation:
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PMID: 18574953 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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DMPP (3,4-dimethylpyrazole phosphate) has been used to reduce nitrogen (N) loss from leaching or denitrification and to improve N supply in agricultural land. However, its impact on soil nitrifying organisms and enzyme activities involved in N cycling is largely unknown. Therefore, an on-farm experiment, for two years, has been conducted, to elucidate the effects of DMPP on mineral N (NH4(+)-N and NO3(-)-N) leaching, nitrifying organisms, and denitrifying enzymes in a rice-oilseed rape cropping system. Three treatments including urea alone (UA), urea + 1% DMPP (DP), and no fertilizer (CK), have been carried out. The results showed that DP enhanced the mean NH4(+)-N concentrations by 19.1%--24.3%, but reduced the mean NO3(-)-N concentrations by 44.9%--56.6% in the leachate, under a two-year rice-rape rotation, compared to the UA treatment. The population of ammonia oxidizing bacteria, the activity of nitrate reductase, and nitrite reductase in the DP treatment decreased about 24.5%--30.9%, 14.9%--43.5%, and 14.7%--31.6%, respectively, as compared to the UA treatment. However, nitrite oxidizing bacteria and hydroxylamine reductase remained almost unaffected by DMPP. It is proposed that DMPP has the potential to either reduce NO3(-)-N leaching by inhibiting ammonia oxidization or N losses from denitrification, which is in favor of the N conversations in the rice-oilseed rape cropping system. |
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Authors:
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Hua Li; Xinqiang Liang; Yingxu Chen; Yanfeng Lian; Guangming Tian; Wuzhong Ni |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of environmental sciences (China) Volume: 20 ISSN: 1001-0742 ISO Abbreviation: J Environ Sci (China) Publication Date: 2008 |
Date Detail:
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Created Date: 2008-06-25 Completed Date: 2009-01-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100967627 Medline TA: J Environ Sci (China) Country: Netherlands |
Other Details:
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Languages: eng Pagination: 149-55 Citation Subset: IM |
Affiliation:
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College of Environmental and Resource, Zhejiang University, Hangzhou 310029, China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bacteria
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isolation & purification,
metabolism Brassica Colony Count, Microbial Crops, Agricultural Fertilizers Nitrate Reductase / metabolism Nitrates / metabolism Nitrite Reductases / metabolism Nitrogen / metabolism* Oryza sativa Pyrazoles / pharmacology* Quaternary Ammonium Compounds / metabolism Soil Microbiology* Urea / pharmacology Water Pollution / prevention & control* |
| Chemical | |
Reg. No./Substance:
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0/3,4-dimethylpyrazole phosphate; 0/Fertilizers; 0/Nitrates; 0/Pyrazoles; 0/Quaternary Ammonium Compounds; 57-13-6/Urea; 7727-37-9/Nitrogen; EC 1.7.-/Nitrite Reductases; EC 1.7.99.4/Nitrate Reductase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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