被覆作物を導入しない理由を研究が解明(Why Don’t More Farmers Use Cover Crops? UGA Research Offers Answers)

2026-07-16 ジョージア大学(UGA)

ジョージア大学(University of Georgia:UGA)の研究チームは、環境保全に有効とされる被覆作物(カバークロップ)の普及が進まない理由を調査した。作物収穫後に栽培する被覆作物は、土壌侵食の抑制、雑草管理、土壌改良など多くの利点を持つが、導入状況は農家によって大きく異なる。研究では、全米の多様な農業経営を行う86人の農家への詳細な聞き取り調査を実施し、「導入しているか否か」という単純な分類では実態を説明できないことを明らかにした。農家の意思決定は、気候や土壌条件、水資源、市場環境、病害虫、経営規模、作業負担、経済的リスク、行政や専門家への信頼など、地域や個々の事情が複雑に絡み合って形成されていた。研究チームは、被覆作物の普及には一律の普及策ではなく、それぞれの農家の状況や価値観に応じた柔軟な支援や政策設計が必要であると指摘している。本研究は、農業技術の導入を科学的・社会的な視点から捉え直し、持続可能な農業を推進するための新たな知見を提供する成果となった。

<関連情報>

被覆作物の栽培に万能な方法はない:普及活動に役立てるため、被覆作物に関する農家の考え方を探る There’s not one-size-fits-all for cover cropping: Exploring farmers’ mindsets on cover crops to inform outreach

Maria Teresa Tancredi,Robert L. Myers,Nicholas Tuschak Basinger &Jennifer Jo Thompson
Journal of Soil and Water Conservation  Published:11 Jun 2026
DOI:https://doi.org/10.1080/00224561.2026.2656578

被覆作物を導入しない理由を研究が解明(Why Don’t More Farmers Use Cover Crops? UGA Research Offers Answers)

Abstract

Faced with climate change, dwindling resources, and the world’s growing population, agriculture must become more sustainable, efficient, and resilient. Research shows that practices like cover crops can help meet these needs, but their use in the United States remains limited, with only 4.7% of farmed acres utilizing cover crops. Against this backdrop, we used semistructured interviews and Q methodology to explore row crop commodity farmers’ perspectives on cover crops in the US Northeast, Southeast, and Midwest regions. While past research has attempted to identify and isolate factors influencing adoption (i.e., perceived benefits, barriers, and motivations), this project investigates farmers’ holistic perspectives on cover crops by grounding their decision to adopt (or not) in their overall view of commodity agriculture. Our analysis reveals 14 distinct mindsets across the three US regions, with points of convergence suggesting that some viewpoints extend beyond regional boundaries. Importantly, this work finds that different perspectives on cover crops span both adopters and nonadopters in the same regions, demonstrating that adoption is not itself a mindset and highlighting why “one-size-fits-all” outreach efforts have failed to generate higher implementation rates. By investigating farmers’ mindsets on cover crops, this research provides much-needed information for outreach targeted to farmers’ needs, beliefs, and priorities, thus supporting increased and successful cover crop adoption across the country.


導入の多様性を探る:米国農家は被覆作物の長期性、完全性、多様性、そして相互補完性をどのように管理しているか Navigating the adoption spectrum: how U.S. farmers manage longevity, entirety, variability

Lauren Hunt,Maria Teresa Tancredi,Meredith T. Niles & Jennifer Jo Thompson
Agriculture and Human Values  Published:28 April 2026
DOI:https://doi.org/10.1007/s10460-026-10885-7

Abstract

Understanding how farmers adopt conservation farming practices is critical for advancing agricultural sustainability, yet adoption is often treated as a binary outcome. This binary view risks underestimating commitment by mislabeling adaptive management as disadoption, while overestimating environmental benefits by equating small trials with whole-farm adoption. To expand our understanding of adoption, we apply a multidimensional framework – capturing longevity, entirety, variability, and complementarity – to examine how farmers make decisions about cover crops as a focal conservation practice. Drawing on in-depth interviews with 86 farmers across nine U.S. states, we show that adoption is not a linear or uniform process, but a dynamic navigation of trade-offs. Farmers frequently described trialing and partial implementation as strategic resilience mechanisms, discontinuity as a response to shifting constraints rather than failure, and simplification or selective integration of practices as pathways to long-term viability. Complementary practices were often adopted to enhance ecological and economic synergies, reflecting systems-oriented decision-making rather than isolated practice uptake. Our findings advance understanding of adoption by demonstrating that binary adoption metrics fail to capture the lived reality of management. These insights have direct implications for refining cost-share program efficacy, interpreting ecological outcomes, and designing policies that support durable, whole-farm conservation strategies.

1200農業一般
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