{"created":"2024-04-12T04:39:30.830809+00:00","id":2000216,"links":{},"metadata":{"_buckets":{"deposit":"9b01d2f6-e6f2-4022-8560-b035905a2e9e"},"_deposit":{"created_by":74,"id":"2000216","owner":"74","owners":[74],"pid":{"revision_id":0,"type":"depid","value":"2000216"},"status":"published"},"_oai":{"id":"oai:jircas.repo.nii.ac.jp:02000216","sets":["1704421711574:1705364365398"]},"author_link":[],"item_30002_access_rights4":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_30002_bibliographic_information29":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2001-03-01","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"31","bibliographicPageStart":"23","bibliographicVolumeNumber":"9","bibliographic_titles":[{"bibliographic_title":"JIRCAS Journal","bibliographic_titleLang":"en"}]}]},"item_30002_creator2":{"attribute_name":"作成者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"KANDA, Kenichi","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"TAKAHASHI, Motoki","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"MIRANDA, Cesar H.B.","creatorNameLang":"en"}]}]},"item_30002_description9":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"Agropastoral systems that combine soybean and grasses in a crop rotation have been proposed for sustaining grassland productivity in the low-fertility soils of the Brazilian savanna. We studied the nitrogen flow under an agro-pastoral system developed in 1993 in a Purple Red Latosol in Campo Grande, MS. Four cropping systems were included: continuous soybean cropping, soybean cropping after 4 years of grass cultivation, continuous grass cultivation, grass cultivation after 4 years of soybean cropping. The rate of N fixation in soybean was determined by the N difference method and 15N natural abundance method. A non-nodulating isoline, T201, was used as a control in both methods. The rate of N2 fixation ranged from 23 to 51% of the total plant N. The amount of N taken out as grains was larger than the amount of fixed N in soybean. The amount of N entering the system through rainwater was 6 kgN/ha/yr. Nitrate accumulating in soil from the surface to a depth of 100 cm under soybeans indicated the potential leaching of nitrate. The estimated amount of nitrate leaching from the soybean fields was large compared with that from the grasslands. A large negative N balance of 134-211 kgN/ha/yr was estimated in the soybean fields, whereas the N balance in the grasslands was a slightly negative.","subitem_description_language":"en","subitem_description_type":"Other"},{"subitem_description":"ブラジルのサバンナの低肥沃土地帯の草地の生産力を持続的に維持するために、ダイズと牧草を組み合わせた農牧輪換システムが提案されている。我々は、マットグロッソドスル州カンポグランデ市の赤紫色ラトソル土で1993年から実施している農牧輪換システムにおける窒素のフローを調査した。4種類の作付区を選んだ。：連続ダイズ区、草地4年跡ダイズ区、連続草地区、ダイズ4年跡草地区。ダイズによる窒素固定量は窒素差し引き法と15N自然安定同位体比法から求めた。非根粒着生系統T201を両測定法の対照に用いた。収穫時ダイズ地上部窒素の23～51％が窒素固定由来であり、収穫物として持ち出された窒素量はダイズによる窒素固定量より多かった。雨水からの窒素の年間負荷量は6kgN/haあった。ダイズ畑では硝酸態窒素が表層から1mの深さに蓄積していたことから窒素の溶脱の可能性が指摘された。ダイズ畑からの窒素溶脱量の推定値は草地に比べて多くなった。ダイズ畑の窒素収支は134～211kgN/ha の大きなマイナスとなった。一方、草地でもマイナスとなったが値は小さかった。","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_30002_file35":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available"}],"filename":"jircas_journal9-_23-31.pdf","filesize":[{"value":"531KB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"label":"jircas_journal9-_23-31","objectType":"fulltext","url":"https://jircas.repo.nii.ac.jp/record/2000216/files/jircas_journal9-_23-31.pdf"},"version_id":"7378d1b6-fdc3-42a9-8977-e67de4b7d93e"}]},"item_30002_identifier_registration17":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.34556/0002000216","subitem_identifier_reg_type":"JaLC"}]},"item_30002_language12":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_30002_publisher10":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Japan International Research Center for Agricultural Sciences","subitem_publisher_language":"en"}]},"item_30002_resource_type13":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_30002_source_identifier22":{"attribute_name":"収録物識別子","attribute_value_mlt":[{"subitem_source_identifier":"13407686","subitem_source_identifier_type":"PISSN"},{"subitem_source_identifier":"AA11030483","subitem_source_identifier_type":"NCID"}]},"item_30002_subject8":{"attribute_name":"主題","attribute_value_mlt":[{"subitem_subject":"leaching","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"nitrogen fixation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"soybean","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"grassland","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"nitrogen balance","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_30002_title0":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Nitrogen Flow in Agropastoral Systems, Brazil","subitem_title_language":"en"},{"subitem_title":"ブラジルの農牧輪換システムにおける窒素のフロー","subitem_title_language":"ja"}]},"item_30002_version_type15":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_title":"Nitrogen Flow in Agropastoral Systems, Brazil","item_type_id":"40039","owner":"74","path":["1705364365398"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2024-04-12"},"publish_date":"2024-04-12","publish_status":"0","recid":"2000216","relation_version_is_last":true,"title":["Nitrogen Flow in Agropastoral Systems, Brazil"],"weko_creator_id":"74","weko_shared_id":-1},"updated":"2024-04-12T05:41:51.818575+00:00"}