{"type": "FeatureCollection", "features": [{"id": "10.1007/s10705-011-9447-z", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-07-26T16:14:41Z", "type": "Journal Article", "created": "2011-08-01", "title": "Leaching Losses Of Nitrate Nitrogen And Dissolved Organic Nitrogen From A Yearly Two Crops System, Wheat-Maize, Under Monsoon Situations", "description": "A large amount of nitrogen (N) fertilizers applied to the winter wheat-summer maize double cropping systems in the North China Plain (NCP) contributes largely to N leaching to the groundwater. A series of field experiments were carried out during October 2004 and September 2007 in a lysimeter field to reveal the temporal changes of N leaching losses below 2-m depth from this land system as well as the effects of N fertilizer application rates on N leaching. Four N rates (0, 180, 260, and 360 kg N ha(-1) as urea) were applied in the study area. Seasonal leachate volumes were 87 and 72 mm in the first and second maize season, respectively, and 13 and 4 mm during the winter wheat and maize season in the third rotational year, respectively. The average seasonal flow-weighted NO(3)-N concentrations in leachate for the four N fertilizer application rates ranged from 8.1 to 103.7 mg N l(-1), and seasonal flow-weighted dissolved organic nitrogen (DON) concentrations in leachate varied from 0.8 to 6.0 mg N l(-1). Total amounts of NO(3)-N leaching lost throughout the 3 years were in the range of 14.6 to 177.8 kg ha(-1) for the four N application rates, corresponding to N leaching losses in the range of 4.0-7.6% of the fertilizers applied. DON losses throughout the 3 years were 1.4, 2.1, 3.6, and 6.3 kg N ha(-1) for the four corresponding fertilization rates. The application rate of 180 kg N ha(-1) was recommended based on the balance between reducing N leaching and maintaining crop yields. The results indicated that there is a potential risk of N leaching during the winter wheat season, and over-fertilization of chemical N can result in substantial N leaching losses by high-intensity rainfalls in summer.", "keywords": ["2. Zero hunger", "winter-wheat", "north china plain", "nitrate nitrogen", "in-field lysimeters", "04 agricultural and veterinary sciences", "15. Life on land", "dissolved organic nitrogen", "rotation", "01 natural sciences", "6. Clean water", "corn", "leaching losses", "fertilization", "13. Climate action", "management strategies", "0401 agriculture", " forestry", " and fisheries", "double-cropping system", "agricultural soils", "accumulation", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1007/s10705-011-9447-z"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nutrient%20Cycling%20in%20Agroecosystems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10705-011-9447-z", "name": "item", "description": "10.1007/s10705-011-9447-z", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10705-011-9447-z"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-08-02T00:00:00Z"}}, {"id": "10.1016/j.envpol.2013.01.040", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-26T16:15:50Z", "type": "Journal Article", "created": "2013-02-20", "title": "Greenhouse Gas Emissions From A Wheat-Maize Double Cropping System With Different Nitrogen Fertilization Regimes", "description": "Here, we report on a two-years field experiment aimed at the quantification of the emissions of nitrous oxide (N2O) and methane (CH4) from the dominant wheat-maize double cropping system in North China Plain. The experiment had 6 different fertilization strategies, including a control treatment, recommended fertilization, with and without straw and manure applications, and nitrification inhibitor and slow release urea. Application of N fertilizer slightly decreased CH4 uptake by soil. Direct N2O emissions derived from recommended urea application was 0.39% of the annual urea-N input. Both straw and manure had relatively low N2O emissions factors. Slow release urea had a relatively high emission factor. Addition of nitrification inhibitor reduced N2O emission by 55%. We conclude that use of nitrification inhibitors is a promising strategy for N2O mitigation for the intensive wheat-maize double cropping systems.", "keywords": ["Greenhouse Effect", "China", "oxide emissions", "Nitrogen Dioxide", "organic-carbon", "n2o emissions", "Zea mays", "01 natural sciences", "field experiments", "12. 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Climate action", "nitrification inhibitor", "0401 agriculture", " forestry", " and fisheries", "agricultural soils", "3", "4-dimethylpyrazole phosphate dmpp", "Methane", "Environmental Monitoring"]}, "links": [{"href": "https://doi.org/10.1016/j.envpol.2013.01.040"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Pollution", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.envpol.2013.01.040", "name": "item", "description": "10.1016/j.envpol.2013.01.040", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.envpol.2013.01.040"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-05-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=north+china+plain&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=north+china+plain&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=north+china+plain&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=north+china+plain&offset=2", "hreflang": "en-US"}], "numberMatched": 2, "numberReturned": 2, "distributedFeatures": [], "timeStamp": "2026-07-26T17:57:58.166126Z"}