Environmental Crop Science

Laboratory for Understanding Crop and Environment

For understanding Crop and Environment

Our laboratory is located in Field Science Center, Graduate School of Agriculture, University in Naruko Onsen, Osaki, Miyagi Prefecture, which is about 70km north of Sendai. We studying on the development of environmentally friendly crop production technology based on field research.

More specifically,

 To maintain and enhance biodiversity around rice fields, we study the effect of the organic farming technology “Winter Flooding Paddy Fields” on biodiversity and physic-chemical properties of soils.

Plant roots are important to organ to absorb water and nutrients from soil. We are developing a new method to measure the growth rate of the roots during cultivation and evaluating its impact on soil carbon dynamics.


Professor: Mizuhiko NISHIDA

Associate Professor: Ryosuke TAJIMA

Postdoctoral fellow: Yoshiki TOKONAMI

Postdoctoral fellow: Muxiye

Staff: Atsushi KONNO

M2: Atsuko SASAKI


M1: Minori MORI



  • Jung, H., Tajima, R., Ye, R., Hashimoto, N., Yang, Y., Yamamoto, S., Homma, K. (2023) Utilization of UAV Remote Sensing in Plant-Based Field Experiments: A Case Study of the Evaluation of LAI in a Small-Scale Sweetcorn Experiment.Agriculture. 13: 561.
  • Nasukawa H., Tajima, R., Maria Clarinda Filomena Pereira, Nakamura S., Fukuda M., Naruo, K., Egami, T., Oya T. and Ito, T. (2023) Comparative verification of Mehlich 3 soil analysis methods in Northern Mozambique using microwave plasma–atomic emission spectrometry, Soil Science and Plant Nutrition, 69:5-6, 327-336.
  • Ye, Rongling, Ryosuke Tajima, Ayumi Sadaike, Daiki Saito, Momoko Ogawa, Issei Kawamura, Shun Ishimori, Takayuki Nakajima, Toru Uno, Kenichi Kano, Toyoaki Ito, Yoshihisa Suyama, Shin Kato, Akio Kikuchi, Koki Homma. (2023) Mixed cropping of determinate and indeterminate soybean lines enhances productivity. Field Crops Research. 291: 108785.


  • Akamatsu Y, Tajima R, Uno T, Ito T, Nishida M and Saito M. (2022) Characterization of root traits for phosphorus deficiency tolerance using chromosome segment substitution lines. Plant Root 16: 21-30.
  • Matsuoka-Uno, C., Uno, T., Tajima, R., Ito, T. and Saito, M. (2022) Liming and Phosphate Application Influence Soil Carbon and Nitrogen Mineralization Differently in Response to Temperature Regimes in Allophanic Andosols. Agriculture. 12. 142.
  • Susilawati, P. N., Tajima, R., Giamerti, Y., Yang, Y., Yufdy, M. P., Lubis, I. and Homma, K. (2022) Application of consecutive polyethylene glycol treatments for modeling the seminal root growth of rice under water stress. Scientific Reports. 12. 2096.
  • Tokonami, Y., Funao, T., Oga, T., Nishida, M., Takahashi, T., and Asakawa, S. (2022) Estimation of turnover time of microbial bomass potassium in paddy field soil. Soil Science and Plant Nutrition. 68(2): 275-283
  • Yamashita, Y., Nishida, M., Akita, K., Ito, T., Saito, M., Honjo, H., Shinohara, M., and Asakawa, S. (2022) Pool size of microbial biomas potassium in various farmland soils. Soil Science and Plant Nutrition. 68(3): 400-408


  • Fujii, H., Mori, S., Matsumoto, Y., Sasaki, Y., Ito, C., Nakagawa, S., Takahashi, T., Matsuyama, N., Nishida, M., Kaneta, Y., Fujisawa, H., Tanikawa, N., Ando, T., Shiono, H., Shima, T., Aoyama, M., Morioka, M., Ando, T., Tawaraya, K., Sato, T., Takakai, F., Sato, T., Takahashi, T., Ito, M., Cheng, W., Nakajima, M., Ito, T., Nasukawa, H., Uno, T., Tajima, R., Abe, T., Shinano, T., Saito, T., Wakabayashi, S., Fujimura, S., Matsunami, H., Hirayama, T., Kubo, K., Ota, T., Saito, M., Katagiri, T., Ando, K.(2021) Tohoku Region. In The Soils of Japan, edited by Hatano, R., Shinjo, H., Takata. Springer Nature Singapore Pte Ltd., Singapore, pp. 185-244.
  • Suzuki, T., Uno, T., Tajima, R., Ito, T. and Saito, M. (2021) Optimum range of soil phosphorus fertility needed for effective arbuscular mycorrhizal inoculation of Welsh onions in a non-allophanic Andosol. Soil Science and Plant Nutrition 67 (5). 540-544.
  • Tajima, R. (2021) Importance of individual root traits to understand crop root system in agronomic and environmental contexts. Breeding Science 71(1). 13-19.
  • Takahashi, Tomoki, Nishida, Mizuhiko, Namikawa, Mari. (2021) Facile method for in-sutu measurement of gas diffusion coefficient of soil with semiconductor gas ssensor and iso-butane gas. Japanese Journal of soil science and plant nutrition 92(1): 11-18 (in Japanese)
  • Uno, T., Tajima, R., Suzuki, K., Nishida, M., Ito, T. and Saito, M. (2021) Rice yields and the effect of weed management in an organic production system with winter flooding. Plant Production Science. 24(4). 405-417.


  • Asami, H., Miura, Y., Watanabe, T., Uno, T., Tajima, R., Saito, M., Ito, T. (2020). Silicate fertilizer improves grain quality in brewers’ rice (Oryza sativa L.) ‘Toyonishiki’. Japanese Journal of soil science and plant nutrition. 91(1): 11-20. (in Japanese)
  • Kaneda, Y., Nishida, M., Takakai, F., Sato, T. (2020) New growth diagnosis standards of high-yielding rice and demonstration of high yielding using NDVI by GreenSeeker handheld crop sensor. Japanese Journal of soil science and plant nutrition 91(6): 417-425. (in Japanese)
  • Moritsuka, N., Saito, H., Tajima, R., Takahashi Y., Hirai, H. (2020) Farm-Scale Estimation of Total Nitrogen Content in Surface Paddy Soils by Extraction with Commercially Available Hydrogen Peroxide, Agronomy 10: 40.
  • Obara, K., Homma, K., Tajima, R., Maki, M., Saito, Y., Hashimoto, N., Yamamoto, S. Hongo, C. (2020) Analysis of RGB Images to Estimate SPAD Values in Rice for UAV Remote Sensing Japanease Journal of Crop Science. 89(1): 50-51. (in Japanese)
  • Takahashi, T., Nakano, K., Nira, R., Kumagai, E., Nishida, M., Namikawa, M. (2020) Conversion of soil particle size distribution and texture classification from ISSS system to FAO/USDA system in Japanese paddy soils. Soil Science and Plant Nutrition. 66(3),407-414.
  • Takamoto, A., Takahashi, T., Togami, K., Nishida, M., Tsuchiya, K., Namikawa, M. (2020) Estimation of nitrogen uptake at the mature stage of rice from the dry yield of rough rice. Japanese Journal of soil science and plant nutrition 91(1): 1-10. (in Japanese)


  • Akyol, T. Y., Niwa, R., Hirakawa, H., Maruyama, H., Sato, T., Suzuki, T., Fukunaga, A., Sato, T., Yoshida, S., Tawaraya, K., Saito, M., Ezawa, T., Sato, S. (2019) Impact of Introduction of Arbuscular Mycorrhizal Fungi on the Root Microbial Community in Agricultural Fields. Microbes and Environment. 34(1): 23-32.
  • Naruse, T., Ban, Y., Yoshida, T., Kato, T., Namikawa, M., Takahashi, T., Nishida, M., Asakawa, S., Watanabe, T. (2019) Community structure of microaerophilic ironoxidizing bacteria in Japanese paddy field soils. Soil Science and Plant Nutrition. 65: 460-470.
  • Nasukawa, H., Tajima, R., Muacha, B. I. J., Pereira, M. C. F., Naruo, K., Nakamura, S., Fukuda, M., Ito, T., Homma, K. (2019) Analyzing soil-available phosphorus by the Mehlich-3 extraction method to recommend a phosphorus fertilizer application rate for maize production in northern Mozambique. Plant Production Science. 22: 211-214.
  • Takakai, F., Hatakeyama, K., Nishida, M., Nagata, O., Sato, T., Kaneta, Y. (2019) Effect of the long-term application of organic matter on soil carbon accumulation and GHG emissions from a rice paddy field in a cool-temperate region, Japan-II. Effect of different compost applications-. Soil Science and Plant Nutrition. 66: 96-105.
  • Yamane, K., Mabesa-Telosa, R. C., Tajima, R., Banayo, N. P. M. C., Kato, Y. (2019) A simple, low-cost technique for in situ measurement of leaf P concentration in field-grown rice Journal of Plant Nutrition and Soil Science. 182(1): 28-30.


  • Seto, R., Moritsuka, N., Fujisao, K., Toriumi, A., Homma, K., Tajima, R., Kato, Y., Yamagishi, J., Mekwatanakarn, P., Jongdee, B. (2018) Mild drying of sandy soil can physically limit the uptake of phosphorus by rainfed lowland rice in northeast Thailand. Soil Science and Plant Nutrition. 64, 677-685.
  • Takahashi, Y. Matsushita, T. Ito, Y. Nakai, M. Nanzyo, T. Kobayashi, S. Iwaishi, T. Hashimoto, S. Miyashita, T. Morikawa, S. Yoshida, S. Tsushima and S. Ando. (2018) Comparative analysis of microbial diversity and bacterial seedling disease-suppressive activity in organic-farmed and standardized commercial conventional soils for rice nursery cultivation. Journal of Phytopathology, 166 (4), 249-264.
  • Ito, T., Nasukawa, H., Uno, T., Tajima, R., Saito, M. (2018) Recovery of Tsunami-Affected Paddy Soil Using Calcium Materials for Sustainable Agriculture. Journal of Integrated Field Science. 15, 55-58.
  • Tajima R. (2018) Root Phenotyping with Root Modeling- Towards Sustainable Rice Production. Journal of Integrated Field Science. 15, 48-50.
  • Tomoki Takahashi, Katsuyuki Katayama, Mizuhiko Nishida, Mari Namikawa, Tsuchiya Kazunari. (2018) Effect of using subirrigation and slit tillage to increase soybean (Glycine max) yield in clayey soils in rice paddies converted to uplands. Soil Science and Plant Nutrition. 64, 491-502.
  • Mizuhiko Nishida. (2018) Natural 15N abundance can aid the discrimination of organic and conventional rice. Japan Agricultural Research Quarterly. 52,173-180.
  • Mizuhiko Nishida, Koji Yoshida, Tomoki Takahashi. (2018) Estimation of changes in available soil phosphate under submerged conditions associated with temperature during the tillering stage of rice plant in the cool climate region of Japan. Communications in Soil Science and Plant Analysis. 49, 1695-1706.


  • Gao, X., Kim, S., Minoshima, H., Ito, T., Kitamura, S. (2017) Effect of the mineralogical phases in steelmaking slag fertilizer on the dissolution behavior of nutritious elements and rice growth. Journal of Sustainable Metallurgy, 3, 207-218.
  • Komissarov, Mikhail, Shin-ichiro Ogura, Hiroaki Kato and Masanori Saito (2017) Effects of plowing on vertical distribution of radioactive Cs and soil physicochemical properties in temperate pastures, Grassland Science, 63: 265-272 10.1111/grs.12172.
  • Nakai, Y., T. Nishio, H. Kitashiba, M. Nanzyo, M. Saito, T. Ito. M. Omura, Y. Kanayama: Tohoku University Rapeseed Project for Restoring Tsunami-Salt-Damaged Farmland: Was the Wisdom of Agricultural Science Utilized for the Restoration? In book: Advances in Natural and Technological Hazards Research Volume 47, ”The 2011 Japan Earthquake and Tsunami: Reconstruction and Restoration Insights and Assessment after 5 Years”, Editors: Vicente Santiago-Fandiño, Shinji Sato, Norio Maki, Kanako Iuchi pp.369-383, Springer First Online: 13 July 2017
  • Suzuki, Takae, Toru Uno, Ryosuke Tajima, Toyoaki Ito, Masanori Saito (2017) Optimum level of soil available phosphorus for AMF inoculation to Welsh onion in non-allophanic Andosol, Abstract, 9th International Conference on Mycorrhiza, Prague, 31 July – 4 August, 2017.
  • Tajima, Ryosuke (2017) Phenotyping of root system architecture using root model. 2017 JST International Workshop on Field Phenotyping and Modeling for Cultivation, Tokyo. (8-9/Dec/2017)


  • Asagi, N., Minamide, K., Uno, T., Saito, M., Ito, T. (2016) Acidulocompost, a food waste compost with thermophilic lactic acid fermentation: its effects on potato production and weed growth. Plant Production Science, 19: 132-144.
  • Gao, X., Ito, T., Nasukawa, H., Kitamura, S. (2016) Application of Fertilizer Made of Steelmaking Slag in the Recovery of Paddy Fields Damaged by the Tsunami of 2011. ISIJ International, 56: 1103-1110.
  • Hara, S., Saito, M. (2016) Isolation of inositol hexaphosphate (IHP)degrading bacteria from arbuscular mycorrhizal fungal hyphal compartment hyphaesphere using a modified baiting method involving alginate beads containing IHP. Microbes and Environment, 31: 234-243.
  • Kato, Y., Tajima, R., Toriumi, A., Homma, K., Moritsuka, N., Shiraiwa, T., Yamagishi, J., Mekwatanakern, P., Chamarerk, V., Jongdee. B. (2016) Grain yield and phosphorus uptake of rainfed lowland rice under unsubmerged soil stress. Field Crops Research, 190: 54-59.
  • Yamaguchi, N., Tanikawa, I., Kimura, T., Yoshioka K., Saito M. (2016) Contamination of agricultural products and soils with radiocesium derived from the accident at Fukushima Daiichi Nuclear Power Station: Monitoring, case studies and countermeasures. Soil Science and Plant Nutrition, 62: 303-314.


  • Bautista, E. G., Nghi, N. T., Saito, M., Regalado, M. J. C. (2015) Potential Evaluation of a Locally-Designed Wind-Pump System for Water Pumping to Irrigate Rice Crop Based on a Ten-Year Weather Data in the Philippines. Journal of Integrated Field Science, 12: 9-17.
  • Bautista, E.G., Saito, M. (2015) Greenhouse gas emissions from rice production in the Philippines based on life-cycle inventory analysis. Journal of Food, Agriculture and Environment, 13(1): 139-144.
  • Ito, T., Hara, K., Kon, T., Ohtaka, A.(2015) Effect of winter-flooding and organic farming on density of aquatic oligochaetes in ricefields: Case study in Miyagi prefecture, Northeastern Japan. Journal of Integrated Field Science, 12: 31-37.
  • Matsushita, Y. et al. Saito, M., Sano, T., Tsushima, S. (2015) Community structure, diversity, and species dominance of bacteria, fungi, and nematodes from naturally and conventionally farmed soil: a case study on Japanese apple orchards. Organic Agriculture, 5(1): 11-28
  • Nakai, Y., Nishio,T., Kitashiba, H., Nanzyo, M., Saito, M., Ito, T., Omura, M., Abe, M. Ogushi, Y. (2015) The Agri-Reconstruction Project and Rapeseed Project for Restoring Tsunami-Salt- Damaged Farmland After the GEJE -An Institutional Effort. Santiago-Fandiño, V., Kontar, Y. A., Kaneda, Y. (Eds.), Post-Tsunami Hazard: Reconstruction and Restoration. Advances in Natural and Technological Hazards Research. 44, pp293-310. Springer, Switzerland.
  • Nakao, A., Takeda, A., Ogasawara, S., Yanai, J., Sano, O., Ito, T. (2015) Relationships between paddy soil radiocesium interception potentials and physicochemical properties in Fukushima, Japan. Journal of Evironmental Quality, 44: 780-788.


    Kawatabi Field Center, Graduate School of Agricultural Science, Tohoku University

    • ADRESS: Yomogida, Naruko-onsen, Osaki, Miyagi, 989-6711
    • TEL: 0229-84-7364
    • FAX: 0229-84-7364
    • MAIL: ecs_a_bios.tohoku.ac.jp (replace _a_ with @)