2023 - 2026 Elucidating the genetic mechanism controlling the growth of primary and lateral roots in soybean
2015 - 2018 Sustainable use of fertilizer in terms of resource scarcity: Possible cultivation of soybean independent of biological nitrogen fixation
2014 - 2016 Root phonemics: new method for analyzing root system
2012 - 2016 Construction of pasturing system for sustainable water environment in Mongolia
2010 - 2014 Assessment of resistance of rainfed lowland rice to aerobic condition in northeastern Thailand based on the dynamics of nutrients in soil
2011 - 2013 The Effects on Crop Production and Soil Carbon Sequestration of Root Production and Mortality in Paddy Rice using Organic Fertilizer
2010 - 2012 Development of environment-friendly sustainable rice farming with reuse of new purification plant sludge、 and application of iron or silicon
2007 - 2009 Life cycle assessment of bioethanol production systems
2000 - 2007 Root nodule and nitrogen fixation in relation to root system development in legumes
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Papers (67):
Hisashi Nasukawa, Ryosuke Tajima, Maria Clarinda Filomena Pereira, Joao Antonio Pedro, Satoshi Nakamura, Monrawee Fukuda, Junji Koide, Tetsuji Oya, Koki Homma. Management strategies for regenerative agriculture based on the assessment of soil fertility in northern Mozambique. Geoderma Regional. 2025. 40. e00912-e00912
Kayano Kosuke, Rui Qiuzhi, Nakamura Kota, Tajima Ryosuke, Xu Donghe, Homma Koki. Evaluation of salinity damage on soybean in a small-scall field experiment: II. Spectral changes due to salt treatment. Abstracts of Meeting of the CSSJ. 2024. 258. 121-121
Rui Qiuzhi, Tajima Ryosuke, Ye Rongling, Kameoka Emi, Xu Donghe, Homma Koki. A Method for Estimating Root Volume and Total Root Length Using Soybean Root Images. Abstracts of Meeting of the CSSJ. 2024. 258. 56-56
Kayano Kosuke, Qiuzhi Rui, Kota Nakamura, Ryosuke Tajima, Donghe Xu, Koki Homma. Evaluation of salinity damage on soybean in a small-scall field experiment: I. Establishment of salinity treatment and UAV monitoring. Abstracts of Meeting of the CSSJ. 2023. 256. 78-78
Kawamura Issei, Saito Daiki, Homma Koki, Nakajima Takayuki, Tajima Ryosuke. Mix cropping of determinate and indeterminate soybean cultivars to improve soybean productivity:V. Production efficiency based on LAI vertical distribution by quick assessment. Abstracts of Meeting of the CSSJ. 2019. 248. 0. 93-93
Obara Kasumi, Homma Koki, Tajima Ryosuke, Maki Masayasu, Saito Yuki, Hashimoto Naoyuki, Yamamoto Shuhei, Hongo Chiharu. Analysis of RGB images to estimate SPAD in rice for UAV remote sensing. Abstracts of Meeting of the CSSJ. 2019. 248. 0. 43-43
Ishimori Shun, Saito Daiki, Kawamura Issei, Homma Koki, Nakajima Takayuki, Tajima Ryosuke. Mix cropping of determinate and indeterminate soybean cultivars to improve soybean productivity:VI. Report of cultivation trials from 2016 to 2018 and lodging effect in 2018. Abstracts of Meeting of the CSSJ. 2019. 248. 0. 81-81
Predicting yield, flowering and harvesting dates of highbush blueberry using temperature data: a case study in Field Science Center of Tohoku University
(The 13th International Symposium on Integrated Field Science 2016)
Effect of arbuscular mycorrhizal fungal inoculation on the growth of Welsh onion in soil rich in available phosphate, and characterization of indigenous arbuscular mycorrhizal fungi isolated from the soil
(8th International Conference on Mycorrhiza 2015)