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Employment Record in Research 【 display / non-display 】
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Tokyo University of Agriculture Faculty of Agriculture Department of Agriculture Professor
2025.03
Research Areas 【 display / non-display 】
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Environmental Science/Agriculture Science / Crop production science
Research Interests 【 display / non-display 】
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Rice
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Cultivation
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High-yielding
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Crop
Papers 【 display / non-display 】
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Improvement of Cultivar Composition in Data-driven Large-scale Rice Cultivation with Field-specific Datasets Reviewed
石川哲也, 内藤貴通, 内藤純子, 古渡拳人, 吉永悟志
日本作物学会紀事 93 ( 1 ) 2024
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Improvement in Cultivation Practice of Cultivar ’Akidawara’ in Data-driven Large-scale Rice Cultivation with Field-specific Datasets Reviewed
石川哲也, 山口貴広, 古渡拳人, 吉永悟志
日本作物学会紀事 92 ( 2 ) 2023
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Simple Methods to Estimate Growth Traits in a High Yielding Rice Cultivar ‘Tsukiakari’ in Hokuriku Regions Reviewed
石丸努, 大平陽一, 岡村昌樹, 山口弘道, 古畑昌已, 吉永悟志
日本作物学会紀事 91 ( 4 ) 337 - 345 2022.10
Language：Japanese Publisher：CROP SCIENCE SOCIETY OF JAPAN
For the early maturity and high palatable rice cultivar, ‘Tsukiakari’, to attain the maximum grain yield of 750 g m<sup>–2</sup>, it is important to achieve 35700 spikelets per square meter. We examined the relationship between growth parameters and amount of nitrogen application at the panicle neck node differentiation stage, to attain a high yield and high palatability. Based on a significant linear regression between growth traits, shoot nitrogen content and leaf color based on the single photon avalanche diode (SPAD) value at full heading stage were estimated to be 13.4 g m<sup>–2</sup> and 41.9, respectively, when 35700 spikelets per square meter was achieved. Growth parameters showed a close correlation at the panicle neck node differentiation stage, represented by a significant linear regression. The normalized difference vegetation index (NDVI) value was in the range of 0.26–0.75 and showed a positive and close correlation with growth index value (plant height cm × number of tillers per square meter × SPAD value), indicating that NDVI can be used to estimate the growth index value in ‘Tsukiakari’ at the panicle neck node differentiation stage. We also elucidated that the NDVI value was greatly affected by water depth in the paddy field, and developed a calculation model to estimate the growth parameters of ‘Tsukiakari’ at the panicle neck node differentiation stage by adjusting the NDVI value to the water depth.
DOI： 10.1626/jcs.91.337
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Factors Affecting Variance in Yield Caused by Different Transplanting Times in High-Yield and Good-Eating-Quality Rice Reviewed
Arai-Sanoh Yumiko, Okamura Masaki, Yoshinaga Satoshi, Yabe Shiori, Ogiwara Hitoshi, Kobayashi Nobuya
Japanese Journal of Crop Science 91 ( 2 ) 129 - 135 2022.04
Language：Japanese Publisher：CROP SCIENCE SOCIETY OF JAPAN
To avoid farm work competition and explore the possibility of diversification of cropping, we evaluated the yield and yield characteristics of the transplanting times (early, middle and late) in rice (<i>Oryza sativa</i> L.) for three years using three high-yielding cultivars, “Akidawara”, “Yamadawara” and “Toyomeki”, which have high eating quality. The later the transplanting time, the lower the filled brown rice yield. Sink capacity and the increase in shoot dry weight during grain filling tended to be smaller the later the transplanting time. To reveal the factors lowering the yield in late transplanting, we carried out several analyses under various climate conditions. The relationship between Y/S value, obtained from dividing yield (Y, g m<sup>–2</sup>) by cumulative solar radiation (S, MJ m<sup>–2</sup>) from 30 days before heading to 20 days after heading, and the average daily temperature in the same periods were approximated by a quadratic equation, meaning yield could be explained well by temperature and solar radiation. The maximum value in Y/S was found at around 23.4 to 24.0 ºC. On the other hand, it was inferred that the lower yield in late transplanting was affected not by the average daily temperature before and after heading but by the lower average daily solar radiation.
DOI： 10.1626/jcs.91.129
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A Challenge to Achieve High Yield in Newly Developed Rice Cultivar ‘Tsukiakari’ in Hokuriku Regions
Ishimaru Tsutomu, Ohdaira Youichi, Ohsumi Akihiro, Furuhata Masami, Ookawa Taiichiro, Yoshinaga Satoshi
Japanese Journal of Crop Science 91 ( 1 ) 49 - 58 2022.01
Language：Japanese Publisher：CROP SCIENCE SOCIETY OF JAPAN
<p>A newly developed early maturing and high palatability rice cultivar Tsukiakari has been disseminated in the Hokuriku region. It showed 10% higher grain yield than an early maturing rice cultivar Akitakomachi. This study aimed to clarify the high-yielding characteristics of Tsukiakari through the multi-environmental testing in the Hokuriku region. A total of 47 yield trials during 2017–2019 revealed that the grain yield of Tsukiakari reached a plateau around 750 g m<sup>–2</sup>. From the significant linear regression among grain yield, yield components, and shoot nitrogen content in Tsukiakari, the values obtained were 35,700 spikelets per square meter, 423 panicles per square meter, 83.8% of filled grains, 25.1 g of one-thousand grains, and 14.0 g m<sup>–2</sup> of shoot nitrogen content at a grain yield of 750 g m<sup>–2</sup>. The percentage of perfect grains and grain protein content was estimated to be 72.5% and 7.1% at a grain yield of 750 g m<sup>–2</sup> using the significant linear regression with spikelet number per square meter, which was developed using the data set obtained in 2017–2018 and 2017–2019, respectively. Note that the percentage of perfect grains in 2019 was much lower than that in 2017–2018 due to an extremely high temperature during ripening. Calculated culm length of Tsukiakari at a grain yield of 750 g m<sup>–2</sup> was 80.4 cm, and it is expected to avoid lodging at maturity up to approximately 80 cm. Overall results indicate that Tsukiakari is an elite cultivar that can achieve high yield and grain quality without lodging if rice plants are not subjected to an extremely high temperature during ripening.</p>
DOI： 10.1626/jcs.91.49
Misc 【 display / non-display 】
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The current status and prospects of rice yield improvement in Japan
Satoshi YOSHINAGA
13 ( 4 ) 32 - 37 2025.04
Authorship：Lead author
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Demonstration of introducing smart agricultural technology in large-scale rice farming
吉永悟志
JATAFFジャーナル 10 ( 2 ) 2022
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Demonstration of Iron-coated Paddy Seeding Cultivation of Rice (Oryza sativa L.) Cultivar “Nijinokirameki” by Robot Seeding at Southern Ibaraki Region
石川哲也, 横田修一, 平田雅敏, 小川春樹, 小笠原慎一, 古渡拳人, 板谷恭兵, 澤田寛子, 福嶌陽, 吉永悟志
日本作物学会関東支部会報(Web) 35 2020
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第4回大豆単収の向上に関する研究会-中間的とりまとめに関する議論-
國分牧衛, 佐々木昭博, 吉永悟志, 合瀬宏毅, 八木宏典, 大西麻紀子, 吉田岳志, 小栗邦夫, 松尾元
農業 ( 1667 ) 2020
Honours, Awards and Prizes 【 display / non-display 】
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作物学会技術賞
2025.03 日本作物学会 データ駆動型スマート農業技術を活用した営農管理と収量の「見える化」による大規模経営体における水稲栽培・作付体系の改善
石川哲也 清水ゆかり 吉永悟志
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Best Paper Award
2022.03 Analysis of factors related to varietal differences in the yield of rice (Oryza sativa L.) under Free-Air CO2 Enrichment (FACE) conditions.
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Japanese Society of Crop Science Best Paper Award
2020.03 High temperature and low solar radiation during ripening differentially affect the composition of milky-white grains in rice (Oryza sativa L.) （共著者）.
Tsutomu Ishimaru, Yukinori Nakayama, Noriaki Aoki, Akihiro Ohsumi, Keitaro Suzuki, Takayuki Umemoto, Satoshi Yoshinaga, Motohiko Kondo