open access

https://hdl.handle.net/2115/44286

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

日本語

hilly and mountainous areas

2007

東京農業大学農業経済学会

農村研究

104

42-53

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.

学術雑誌論文

Version of Record

0388-8533

AN00202024