How robust is agriculture of environmental conservation type against invasive alien weeds that threaten the sustainability of agriculture?

2021 Fiscal Year Final Research Report

• Project/Area Number: 18K05894
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 41030:Rural environmental engineering and planning-related
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: MINETA Takuya 国立研究開発法人農業・食品産業技術総合研究機構, 農村工学研究部門, 上級研究員 (70360386)
• Co-Investigator(Kenkyū-buntansha): 石井 圭一 東北大学, 農学研究科, 准教授 (20356322)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Keywords: 侵略的外来植物 / 有機農業 / ナガエツルノゲイトウ / 農業被害 / 駆除コスト

Outline of Final Research Achievements

Alternanthera philoxeroides, invasive alien aquatic weed, spreads on the rural area around Inbanuma, Chiba Prefecture.We estimated maximum economic loss and cost of control by A. philoxeroides in organic paddy fields in this area.As a result, it was estimated that maximum loss amount would be about 3 million yen per 10a, the control cost would increase by 44,500 yen, and the weeding time would increase by 7.2 hours.Moreover, in areas where invasive alien weeds are widespread in irrigation sources and channel, it was difficult to prevent invasion of agricultural land where environment-friendly farming such as organic agriculture is carried out.
In conclusion, it was considered that certain cost is required to preventing colonization of Alternanthera philoxeroides for sustaninable farming.

Free Research Field

農業生態学

Academic Significance and Societal Importance of the Research Achievements

本研究ではナガエツルノゲイトウのような侵略的外来雑草がまん延している地域では，有機農業など環境保全型農業の圃場に侵入すると，経済的損失を発生させないために多大な除草労力やコストが必要となる可能性を示し，慣行栽培の圃場に増して，環境保全型農業の農地への侵入を防ぐことが重要となることを明らかにできた。