{"created":"2022-01-27T08:15:13.604671+00:00","id":2004774,"links":{},"metadata":{"_buckets":{"deposit":"d92810ca-9524-47eb-a001-b33e582d2795"},"_deposit":{"id":"2004774","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2004774"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02004774","sets":["1642838403123","1642838403551:1642838407312"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"熱帯･亜熱帯地域の草地における高位生産型放牧システムの開発と窒素動態に関する研究","subitem_1551255648112":"ja"},{"subitem_1551255647225":"Studies on Development of High Productive Grazing System and Nitrogen Dynamics on Tropical-Subtropical Pasture","subitem_1551255648112":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"川本, 康博","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"Kawamoto, Yasuhiro","creatorNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_1522299639480":"open access","subitem_1600958577026":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"窒素動態"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"ジャイアントスターグラス"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"草地"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"放牧システム"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Nitrogen dynamics"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Pasture"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"パンゴラグラス"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Giant stargrass"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"放牧"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Grazing system"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"科研費番号: 14560227","subitem_description_type":"Other"},{"subitem_description":"平成14年度～平成15年度科学研究費補助金(基盤研究C)研究成果報告書","subitem_description_type":"Other"},{"subitem_description":"研究概要：熱帯・亜熱帯地域の草地における高位生産型放牧システムの開発と窒素動態を解明するため,我が国南西諸島をモデル地域として,肉用牛を対象に調査した。1)暖地型イネ科牧草のジャイアントスターグラス(Cynodon nlemfuensis Vanderyst,以下Gs)について,適正な窒素施肥量を明らかにすると共に,冬季補完草種として寒地型イネ科牧草のイタリアンライグラス(Lolium multiflorum Lam,以下Ir)を追播し,追播に伴う効果と,Ir追播草地の窒素施肥量について併せて検討した.その結果,夏季の採草地での利用に限定した場合,Gs草地の窒素施肥量は1.0kgN/aが望ましく,放牧地での利用の場合は0.5kgN/aの施肥量が乾物収量,栄養価,栄養収量ならびに窒素吸収率の面で効果的であることが明らかとなり,冬季においては生産量が低下することからGs草地の効率的な窒素施肥量は0.5kgN/aと考えられ,Ir追播草地おいては乾物収量や栄養収量の両面からその効果を最大限に高める窒素施肥鼻は0.5kgN/aが望ましいと考えられた.2)弱放牧(4.9頭/ha)と強放牧(6.6頭/ha)がGS放牧草地における^<15>N標識窒素を用いたトレーサー試験による施肥窒素由来の窒素の動態を調査した。その結果,本地域におけるGs放牧草地における地上部(収穫部)の^<15>N回収率は,冬季で低く,夏季で高い傾向にあった.年間の部位別の^<15>N回収量は,強放牧では採食部位(地上部)で、弱放牧では土壌中で最も高かった.植物-土壌系全体でみると^<15>Nの回収率は強放牧(42%)より弱放牧(65%)で高かった.言い換えれば,放牧地圏外への窒素の放出については強放牧と弱放牧でそれぞれ58%と35%になることが推察された.3)Gsとパンゴラグラスそれぞれ基幹草種とする放牧草地を造成し,両放牧草地で試験Iと同水準の追肥を行い,牧養力と施肥窒素の利用効率を比較し,Gsの牧養力は6.7頭/ha/年,パンゴラグラスの場合は5.9頭/ha/年であった。また,^<15>N回収率からみた採取部(摂取部)の施肥窒素の利用効率は,冬季で11-15%,4-5月で34-36%,夏季では約30%となり,^<15>N回収量はGsで40%,パンゴラグラスは38%と差異は認められなかった。4)本地域のこれまでの慣行的牧養力(3頭/ha/年)を,効率的な窒素動態を考慮した放牧システムによって約2倍(6.7頭)に高めることが可能であることが実証された。","subitem_description_type":"Other"},{"subitem_description":"The study was conducted firstly to clarify the potential carrying capacity of giant stargrass was evaluated under different stocking rates in intensive rotational grazing system. Secondly, the nitrogen dynamics through fertilization was estimated under different stocking rates with 15N tracer methods. The followings are the major results. 1)Grazing trials were conducted to estimate a potential carrying capacity of giant stargrass based on the results which the optimum cutting frequency is 4-6 weeks and the effective nitrogen application level is 0.5 Nkg/a after cutting or grazing in giant stargrass grazing pasture. High pasture availability and good quality forage to bring about the effective animal production were produced by using relatively heavy stocking rates of 6-8 heads/ha. 2)Annual ryegrass(Lolium multiflorum Lam.) was overseeded to heighten a nutritive production on the low productive giant stargrass pasture during short winter in this district. Pasture utilization and daily dry matter intake on the pasture overseeded with ryegrass were higher than pure giant stargrass. Average pasture availability and utilization at heavy stocking rate was higher than at light stocking rate even in winter. 3)The fate of ^<15>N-labeled fertilizer nitrogen applied was estimated under two stocking. ^<15>N recovered by harvested part(same as intake part) was 10-43% through the year, and which value was higher under heavy stocking rate(6.4 heads/ha). ^<15>N recovered in soil was higher under light stocking rate(3.2 heads/ha). From the research, it can be concluded that the carrying capacity of giant stargrass pasture, managed effectively was doubled with increasing pasture and animal production comparing with the present traditional grazing system.","subitem_description_type":"Other"},{"subitem_description":"研究代表者：川本康博","subitem_description_type":"Other"},{"subitem_description":"研究報告書","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"ja","subitem_1522300316516":"川本康博"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_1551255818386":"jpn"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/11708"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_1522646500366":"NCID","subitem_1522646572813":"BA7469115X"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004-05","bibliographicIssueDateType":"Issued"}}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_1522305645492":"VoR","subitem_1600292170262":"http://purl.org/coar/version/c_970fb48d4fbd8a85"}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","filename":"14560227-3.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2004774/files/14560227-3.pdf"},"version_id":"fe263edd-5daf-4b41-8638-1c69310bc4a3"},{"accessrole":"open_access","filename":"14560227-2.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2004774/files/14560227-2.pdf"},"version_id":"94d6f7fc-17e5-4e87-8cd1-8196c8496da9"},{"accessrole":"open_access","filename":"14560227-1.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2004774/files/14560227-1.pdf"},"version_id":"f673aa9c-0996-40f1-aa75-24a81568c8bf"}]},"item_title":"熱帯･亜熱帯地域の草地における高位生産型放牧システムの開発と窒素動態に関する研究","item_type_id":"15","owner":"1","path":["1642838403123","1642838407312"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2009-08-04"},"publish_date":"2009-08-04","publish_status":"0","recid":"2004774","relation_version_is_last":true,"title":["熱帯･亜熱帯地域の草地における高位生産型放牧システムの開発と窒素動態に関する研究"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-10-31T02:22:32.722790+00:00"}