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物質循環からみる耕畜連携営農集団の持続性に関する課題 : 広島県庄原市ー木営農集団の窒素循環事例から

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Title: 物質循環からみる耕畜連携営農集団の持続性に関する課題 : 広島県庄原市ー木営農集団の窒素循環事例から
Other Titles: Sustainability of Group Farming in the Cooperation System between the Cultivation Sector and the Livestock Sector from Viewpoint of Material Cycle : A Case Study of Nitrogen Cycle in Hitotsugi Group Farming
Authors: 佐藤, 寿樹1 Browse this author
藤田, 泉2 Browse this author
宮本, 誠3 Browse this author
Authors(alt): Satou, Toshiki1
Fujita, Izumi2
Miyamoto, Makoto3
Keywords: 有畜複合農業
nitrogen cycle
cooperation system between the cultivation sector and livestock sector
group farming
hilly and mountainous areas
Issue Date: 2007
Publisher: 東京農業大学農業経済学会
Journal Title: 農村研究
Volume: 104
Start Page: 42
End Page: 53
Abstract: 本稿は,中山間地域に位置する広島県庄原市一木(ヒトツギ)営農集団を事例として,耕畜連携を行っている営農集団の窒素循康分析を行い,その循環と環境負荷を考慮した持続的営農集団の課題について考察したものである。今回の分析により,営農集団の窒素循環およびその課題として,以下の点が明らかになった。 ① 農地と畜産間の窒素循環には,まだまだ偏りが存在し実際に系内を循環している窒素量は系外からの投入量に対して約7.2%(N循環率)である。 窒素の循環は,単位圃場面積当り牛飼養頭数に大きく依存している可能性がある。 ② 系外から流入する窒素のうち, 85%は購入飼料が占め,飼料の系外依存度が高い。 ③ 圃場別の窒素投入量偏差が大きい。特に,牧草地の窒素投入量は308kg/haにのぼり,許容限界窒素量を超えている可能性がある。 ④ 以上の窒素循環解析を踏まえ,今後,放牧など飼料自給率の向上対策や圃場別の窒素投入量の管理対策が必要と考えられる。
ln this paper,the nitrogen cycle of group farming in the cooperation system between the cultivation sector and the livestock sector is analyzed. The paper is a case study of Hitotsugi group farming in Hiroshima prefecture. The purpose of the paper is to exam the sustainable farming system that takes environmental considerations into account From this analysis,t he main points to emerge are as follows; (1) For the nitrogen cycle in the group farming,t here is deviation of nitrogen fiow between the cultivation sector and the livestock sector. Also,the nitrogen cycle in the group farming is 7.2 percent of the total nitrogen input from outside of the group farming. It is thought that the nitrogen cycle relates to the number of livestock heads per field area. (2) The nitrogen input of feed accounts for 85 percent of the total nitrogen input from outside of the group farming. In spite of aiming to increase the rate of self-sufficiency of feed,there is much dependence on feed from outside of the group farming. (3) There is much deviation of nitrogen input between a forage crop field and a field that has been converted from ap addy into upland. Nitrogen input in10 af orage crop field is estimated at 308 kg/ha,a nd there is a possibility that this figure is beyond the acceptable limit. (4) From these results of nitrogen cycle analysis,a m easure increasing the rate of self-sufficiency of feed and the management of nitrogen input into fields are necessary.
Type: article
Appears in Collections:サステイナビリティ推進機構 (Institute for the Advancement of Sustainability) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 寿樹

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