Managements for preserving soil crop productivity in fallow arable ecosystem

Research Project

Project/Area Number	15K07271
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Crop production science
Research Institution	The University of Tokyo
Principal Investigator	Yamagishi Junko 東京大学, 大学院農学生命科学研究科(農学部), 教授 (60191219)
Co-Investigator(Kenkyū-buntansha)	中元朋実京都工芸繊維大学, 応用生物学系, 教授 (50180419)
Project Period (FY)	2015-04-01 – 2018-03-31
Project Status	Completed (Fiscal Year 2017)
Budget Amount *help	¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000) Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000) Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000) Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords	栽培・作付体系 / 土壌肥沃度 / 休閑 / コムギ / トウモロコシ / 雑草 / ソバ / 作付体系
Outline of Final Research Achievements	Upland fields that are not to be planted for some reason should be kept in the cropping system as fallow land without being used for other purposes. However, no management method has been established at all. Therefore, we examined management methods and aimed to propose a method to contribute to maintaining soil productivity. As a result, from the viewpoint of the crop growth immediately after the fallow stoppage, the control by the rotary cultivation was the best, but this effect was only for a single year, then it decreased markedly. In other words, from the viewpoint of the long-term change, it became clear that the soil fertility is maintained or somewhat improved by the method of mowing grass or leaving without doing anything. It was concluded that the weeds are retained and nutrients do not leak out of the field and the aggregate structure of the soil is maintained or developed.