TOYODA Koki

Professional Career

1996 - 1998 : Assistant, Faculty of Agriculture, Nagoya University
1998 : Assistant Professor, Faculty of Agriculture, Nagoya University
1999 : Assistant, Graduate School of Bio-Applications and Systems Engineering, Nagoya University
2001 - 2007 : Assistant Professor, Institute of Agriculture, Tokyo University of Agriculture and Technology
2007 - 2011 : Associate Professor, Institute of Agriculture, Tokyo University of Agriculture and Technology
2011 - 現在 : Professor, Institute of Agriculture, Tokyo University of Agriculture and Technology

Academic Degrees

1993/03 : Ph.D., Agricultural Science, Nagoya University

Research Interests

Study on the ecology of soil microorganisms in soil

Publications

• Aoto Fujikawa, Roland N. Perry and Koki Toyota. Occurrence of a population of the root-knot nematode, Meloidogyne incognita, with low sensitivity to two major nematicides, fosthiazate and fluopyram in Japan. Pest Management Science, DOI10.1002/ps.8468, accepted on September 24, 2024.
• Risako Kato, Karl Ritz and Koki Toyota. Enchytraeid-stimulation of nitrogen mineralization from green plant residues in an organic soil. PEDOBIOLOGIA, 104, 150957 (2024), accepted on March 15, 2024, https://doi.org/10.1016/j.pedobi.2024.150957
• Yanyan Yang, Junnan Wu, Koki Toyota, Roland N Perry. Evaluation of soil suppressiveness of various Japanese soils against the soybean cyst nematode Heterodera glycines and its relation with the soil chemical and biological properties. Agronomy-Basel, 13, 2826 (2023) https://doi.org/10.3390/agronomy13112826
• Yayun ZENG, Roland N. PERRY, Koki TOYOTA. Effect of short-term growth of mung bean and its incorporation with nitrogen fertiliser on the density of the root-knot nematode, Meloidogyne incognita, in soil. Nematology, in press, DOI: 10.1163/15685411-bja10265
• Doan Thi Truc Linh, Chau Minh Khoi, Karl Ritz, Nguyen Van Sinh, Nguyen Thi Kim Phuong, Huynh Mach Tra My, Tran Ba Linh, Dang Duy Minh, Thi Tu Linh, Koki Toyota. Effects of Rice Husk Biochar and Compost Amendments on Soil Phosphorus Fractions, Enzyme Activities and Rice Yields in Salt-Affected Acid Soils in the Mekong Delta, Viet Nam. Agronomy-Basel 2023, 13, 1593. https://doi.org/10.3390/agronomy13061593
• Nguyen Van Sinh, Doan Thi Truc Linh, Nguyen Thi Kim Phuong, Karl Ritz and Koki Toyota: Transmissible Effects of a Biochar Amendment to an Upper Soil Zone Upon an Associated Lower Zone, Including Attenuation of Soybean Cyst Nematode (Heterodera glycines). Agronomy 2023, 13, 53. https://doi.org/10.3390/agronomy13010053
• Motonori Takagi, Shigeyuki Sekimoto, Takayuki Mizukubo, David Wari, Mitsuteru Akiba, Roland N. Perry, Koki Toyota: Geographical distribution and phylogenic relationships of Hirschmanniella diversa Sher (Nematoda: Pratylenchidae) in Japan. Nematology,25(1), 45-58, 2023
• Sinh Van Nguyen, Seiya Chikamatsu, Risako Kato, Khoi Minh Chau, Phuong Kim Thi Nguyen, Karl Ritz, Koki Toyota: A biochar improves the efficacy of green manure‑based strategies to suppress soybean cyst nematode (Heterodera glycines) and promotes free‑living nematode populations. Journal of Soil Science and Plant Nutrition (J. Soil Sci. Plant Nutr.), https://doi.org/10.1007/s42729-022-00896-8, 22 (3), 3414-3427, 2022
• Nguyen Van Sinh, Risako Kato, Doan Thi Truc Linh, Nguyen Thi Kim Phuong and Koki Toyota. Influence of Rice Husk Biochar on Soil Nematode Community under Upland and Flooded Conditions: A Microcosm Experiment. Agronomy-Basel, 2022, 12, 378. https://doi.org/10.3390/agronomy12020378
• Sawada K, Watanabe S, Nguyen HL, Sugihara S, Seki M, Kobayashi H, Toyota K, Funakawa S. 2021. Comparison of the sturucture and diversity of root-associated and soil microbial communitites between acacia plantations and native tropical mountain forests. Frontiers in Microbiology (Front. Microbiol.), 12, 735121 https://doi.org/10.3389/fmicb.2021.735121
• Lin Zar Ni, Yu Yu Min and Koki Toyota. Infestation of rice white tip nematode, Aphelenchoides besseyi (Christie, 1942), in Myanmar. Russian Journal of Nematology (Russ. J. Nematol.), 28, 85-89 (2020) doi: 10.24411/0869-6918-2020-10008
• Kozue Sawada, Yoshiyuki Inagaki, Soh Sugihara, Shinya Funakawa, Karl Ritz, Koki Toyota. Impacts of conversion from natural forest to cedar plantation on the structure and diversity of root-associated and soil microbial communities. Applied Soil Ecology (Appl. Soil Ecol.), 167: 104027, https://doi.org/10.1016/j.apsoil.2021.104027
• Masanori Kawanobe, Koki Toyota, Karl Ritz. Development and application of a DNA metabarcoding method for comprehensive analysis of soil nematode communities. Applied Soil Ecology (Appl. Soil Ecol.), 166, 103974, https://doi.org/10.1016/j.apsoil.2021.103974
• Seiya Chikamatsu, Ai Takeda, Kazuhiro Ohta, Takeo Imura, Roland N. Perry and Koki Toyota. Suppression of the soybean cyst nematode, Heterodera glycines, by short-term cultivation of mung bean and its plowing in field. Nematology, 23, 3, 305-315, DOI 10.1163/15685411-bja10042
• Nguyen, V.S., Chau, M.K., Nguyen, T.K.P., Araki, M., Perry, R.N., Dang, D.M., Tran, B.L., Lee, C.G. & Toyota, K. 2020. Impacts of saltwater intrusion on soil nematodes community in alluvial and acid sulfate soils in paddy rice fields in the Vietnamese Mekong Delta. Ecological Indicators (Ecol. Indic.), 122, 107284 (2021) https://doi.org/10.1016/j.ecolind.2020.107284, Mar 2021
• Nguyen V. S., Chau, M. K., Nguyen, T. K. P., Perry, R.N., Dang, D. M., Tran, B. L., Toyota, K. Impact of fallow conditions, compost and silicate fertilizer on soil nematode community in salt–affected paddy rice fields in acid sulfate and alluvial soils. Agronomy-Basel, 2021, 11, 425. https://doi.org/10.3390/agronomy11030425
• Sinh Van NGUYEN, Phuong Kim Thi NGUYEN, Masaaki ARAKI, Roland N. Perry, Linh Ba TRAN, Khoi Minh CHAU, Yu Yu MIN and Koki TOYOTA. Seasonal variation and vertical distribution of nematode communities and their relation to the soil chemical property and rice productivity of clay soil under triple rice cultivation in the Mekong Delta, Vietnam. Nematology,23, 33-46 (2021) DOI 10.1163/15685411-bja10028
• Yu Yu Min, Thue Htet Naing, Nwe Nwe Htun, Aung Kyaw Myint, Yuri Ichinose, Atsushi Yoshimura, Roland Perry, and Koki Toyota. Distribution of pigeon pea cyst nematode and root-knot nematodes in major sesame growing areas in Myanmar. Agronomy, 2020, 10, 1457; doi:10.3390/agronomy10101457
• Phuong, N. T. K., C. M. Khoi, K. Ritz, T. B. Linh, D. D. Minh, T. A. Duc, N. V. Sinh, T. T. Linh, and K. Toyota. Influence of rice husk biochar and compost amendments on salt contents and hydraulic properties of soil and rice yield in salt‐affected fields. Agronomy-Basel 2020, 10, 1101; doi:10.3390/agronomy10081101
• Sinh Van Nguyen, Phuong Nguyen Thi Kim, Masaaki Araki, Roland Perry, Tran Ba Linh, Min Yu Yu, Koki Toyota. Effects of cropping systems and soil amendments on nematode community and its relationship with soil physicochemical properties in a paddy rice field in the Vietnamese Mekong Delta. Applied Soil Ecology (Appl. Soil Ecol.), 156, 103683, https://doi.org/10.1016/j.apsoil.2020.103683
• Nguyen Thi Kim Phuong, Chau Minh Khoi, Karl Ritz, Nguyen Van Sinh, Mitsunori Tarao, Koki Toyota. Potential Use of Rice Husk Biochar and Compost to Improve P Availability and Reduce GHG Emissions in Acid Sulfate SoilAgronomy-Basel, 2020, 10, 685; doi:10.3390/agronomy10050685
• Motonori Takagi, Maki Goto, David Wari, Mina Saito, Roland N. Perry, Koki Toyota. Screening of nematicides against the lotus root nematode, Hirschmanniella diversa Sher (Tylenchus: Platylenchidae), and efficacy of a selected nematicide under lotus micro-field conditions. Agronomy 2020, 10, 373, doi:10.3390/agronomy10030373