{"created":"2023-10-11T06:16:06.570823+00:00","id":2000004,"links":{},"metadata":{"_buckets":{"deposit":"8e6d8ca9-d61a-48f5-894a-9e104a2d9db3"},"_deposit":{"created_by":18,"id":"2000004","owner":"18","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"2000004"},"status":"published"},"_oai":{"id":"oai:jicari.repo.nii.ac.jp:02000004","sets":["674"]},"author_link":[],"control_number":"2000004","item_10002_biblio_info_7":{"attribute_name":"bibliographic_information","attribute_value_mlt":[{"bibliographicIssueNumber":"Discussion Paper No.7","bibliographicNumberOfPages":"45","bibliographicPageEnd":"43","bibliographicPageStart":"1","bibliographicVolumeNumber":"Discussion Paper","bibliographic_titles":[{"bibliographic_title":"Discussion Paper No.7"}]}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The use of agricultural machinery is increasingly common in sub-Saharan Africa. However, its potential benefits for smallholder farmers remain unclear. This study uses three-year panel data collected from rice farmers in Tanzania to examine the effects of four-wheeled tractors, small two-wheeled tractors, and draft animals on the expansion of the cultivated area (extensification), adoption of yield-enhancing technologies, land productivity (intensification), and labor productivity. We apply a multinomial endogenous treatment effect model with Mundlak-Chamberlain devices to account for the endogeneity problem. We find that large four-wheeled tractor use contributes to the extensification and increased labor productivity but has a negative effect on land productivity. On the other hand, small two-wheeled tractor use contributes to extensification, the adoption of yield-enhancing technologies, and an increase in paddy yield but has no impact on labor productivity. Our results suggest that large- and small-size tractors play different roles, but both can contribute to enhancing rice production in sub-Saharan Africa.","subitem_description_type":"Abstract"},{"subitem_description":"近年、サブサハラ・アフリカにおいて農業機械化に注目が集まっている。しかし、農業機械化が小規模農家に与える影響については十分な研究がなされていない。特に、これまで大型トラクターと小型トラクターの比較は行われてこなかった。本研究ではタンザニアの3時点のパネルデータを用いて、大型トラクター、小型トラクター、及び牛耕が稲作の技術採用、土地生産性、労働投入及び労働生産性に与える影響を検証する。分析にはMultinominal endogenous treatment effect model及びMundlak-Chamberlain devicesを用いて、可能な限り農家による機械利用の内生性をコントロールした。その結果大型トラクターは耕作面積の拡大と労働生産性の向上に寄与するが、土地生産性を減少させることが明らかになった。他方、小型トラクターは耕作面積の拡大と労働集約的な技術の採用、単位面積当たりの収量を向上させるが、労働生産性には影響がないことが明らかになった。これらの結果は大型トラクターと小型トラクターが稲作生産向上に対して別の役割を果たしうることを示唆している。","subitem_description_type":"Abstract"}]},"item_10002_identifier_registration":{"attribute_name":"identifier_registration","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.18884/0002000004","subitem_identifier_reg_type":"JaLC"}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"JICA Ogata Sadako Research Institute/緒方貞子平和開発研究所"}]},"item_access_right":{"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_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Eustadius Francis Magezi and Yuko,Nakano and Takeshi,Sakurai"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2023-10-11"}],"filename":"Discussion Paper No.7.pdf","filesize":[{"value":"921 KB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"url":"https://jicari.repo.nii.ac.jp/record/2000004/files/Discussion Paper No.7.pdf"},"version_id":"62f9dd6a-0cfb-48f2-b9da-0596d133f2cc"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Rice production, Agricultural Mechanization, Agricultural productivity; Sub-Saharan Africa; Tanzania"},{"subitem_subject":"稲作、農業機械化、農業生産性、サブサハラ・アフリカ、タンザニア"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"item_resource_type","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Mechanization, Intensification, and Extensification of Agriculture: Evidence from Rice Farming in Tanzania","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Mechanization, Intensification, and Extensification of Agriculture: Evidence from Rice Farming in Tanzania","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"18","path":["674"],"pubdate":{"attribute_name":"公開日","attribute_value":"2023-03-31"},"publish_date":"2023-03-31","publish_status":"0","recid":"2000004","relation_version_is_last":true,"title":["Mechanization, Intensification, and Extensification of Agriculture: Evidence from Rice Farming in Tanzania"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2025-04-16T04:34:36.633506+00:00"}