Development of a soil improvement materials using ceder bark and sludge with free-living nematodes.

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K06346
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 41050:Environmental agriculture-related
• Research Institution: Gunma National College of Technology
• Principal Investigator: Owada Kyoko 群馬工業高等専門学校, 物質工学科, 教授 (10203952)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 土壌改良資材 / 線虫 / 活性汚泥 / バイオマス

Outline of Final Research Achievements

Soil improvement materials were developed to control crop damage caused by plant parasitic nematodes, using unused local biomass such as cedar bark, dried sludge, and dehydrated soil. Free-living nematodes and Bacillus subtilis were used as indicator organisms. The number of indicator organisms in the material and the mixing ratio of the material constituents that are effective in suppressing continuous cropping damage were determined based on field tests of Chinese Yam, and DNA analysis was conducted to identify the species of free-living nematodes that cause crop damage control. Developmental improvement material with the addition of bean curd refuse was found to be effective in suppressing soybean cyst nematodes in edamame fields.

Free Research Field

分子生理学

Academic Significance and Societal Importance of the Research Achievements

農作物の植物寄生性線虫被害による経済的損失は世界で年間数十兆円と見積もられ、連作障害抑止が第一の植物寄生性線虫被害の防除である。実圃場試験によりこの抑制効果が認められた土壌改良資材の開発は、国内外の農業への経済的効果のみならず、地域の未利用バイオマス、特に林業における杉バークの有効利用及びし尿処理場の乾燥汚泥の活用、化学農薬使用低減による安全かつ循環型農業の持続可能な社会への貢献に大きな意義がある。