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Faculty of Agriculture Region of Animal and Plant Biosciences Center for Innovative Agriculture |
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Associate Professor |
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Related SDGs |
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ISHIGAKI Genki
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Research Areas 【 display / non-display 】
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Environmental Science/Agriculture Science / Crop production science
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Environmental Science/Agriculture Science / Science in plant genetics and breeding
Papers 【 display / non-display 】
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Umino R., Ng H.M., Tanaka H., Ishigaki G.
Australian Journal of Crop Science 19 ( 10 ) 1035 - 1040 2025.10
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Australian Journal of Crop Science
This study investigated the agronomical traits of three soybean (Glycine max L. Merr) cultivars differing in maturity stages—extremely early-maturing ‘Yukihomare’ (Yu), early-maturing ‘Kitamusume’ (Ki), and late-maturing ‘Fukuyutaka’ (Fu)—intercropped with Rhodes grass (Chloris gayana Kunth.) in the southwest warm region Japan (Experiment I) and their applicability to agricultural machinery system (Experiment II). In Experiment I, soybeans were sown under different seeding rates at 10 seeds/m<sup>2</sup> in 2022 and 20 seeds/m<sup>2</sup> in 2023. As a result, while ‘Fu’ showed the lowest germination rate in 2022, it had the same trend in mean of two years (54%). At 90 days after sowing in 2023, plant height of ‘Fu’ was significantly higher among cultivars and had the highest dry matter yield (DMY) of 448 kg/10a with a soybean mixing rate of 93.1%, indicating improved soybean competitiveness with Rhodes grass under higher seeding rate. In Experiment II, broadcaster seeding trial identified a 10 m operational spacing as optimal for achieving the target seeding rate of 20 seeds/m<sup>2</sup> based on the result of Experiment I. Subsequently, a performance using agricultural machinery for seeding and harvesting showed that DMY of ‘Fu’ (344kg/10a) was significantly higher than that of Rhodes grass (101kg/10a). However, lodging and harvesting inefficiencies resulted in an estimated dry matter loss of 59.4 kg/10a (13.4%), highlighting the need for further refinement of mechanical harvesting. These findings demonstrate the potential of late-maturing soybean cultivar ‘Fu’ for forage production in intercropping systems and suggest the feasibility of mechanized cultivation and harvest at a practical scale.
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Agronomic performance, biomass production, and nutrient value of three napier grass cultivars (Pennisetum purpureum) in highland area Reviewed International coauthorship
Sidik Prasojo Y., Pastawan V., Prasetyo B., Kamal M., Khoirul Anwar M., Prastyo R.A., Iqbal Faruqi M., Ishigaki G.
BIO Web of Conferences 155 2025.1
Language：English Publishing type：Research paper (scientific journal) Publisher：BIO Web of Conferences
The study aims to determine the agronomic performance, biomass production, and nutrient value of three Pennisetum purpureum cultivar (Biovitas, Pakchong, and Mott) in 1000 meters above sea level (asl) highland area of Petungkriyono, Pekalongan, Central Java, Indonesia. The grasses were planted using vegetative stems and maintained for four months, following completely randomized design (CRD) with four replications for each cultivar. Agronomic performance was assessed before harvested. Napier grass was harvested to investigate the biomass production and nutrient values, including organic matter, crude protein, crude protein yield, crude fibre, and crude fat. Pakchong had the highest biomass and crude fiber content. Biovitas exhibited the highest agronomic performance, with superior plant height, leaf length, leaf width, and stem diameter, as well as the highest nutrient values in term of organic metters. Mott showed the highest tiller number and crude protein content among the cultivars. The distinct strength of each cultivar indicates their potential suitability for various agricultural applications in highland regions.
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Effect of yellow light irradiation on the growth of Maize (<i>Zea mays</i> L.) Reviewed
Ishigaki Genki, Adachi Tetsuya
Japanese Journal of Grassland Science 70 ( 4 ) 180 - 184 2025.1
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
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Prasetyo B., Suwignyo B., Ishigaki G., Gondo T., Jati D.K., Prasojo Y.S.
Asian Journal of Plant Sciences 24 ( 1 ) 51 - 59 2025
Publishing type：Research paper (scientific journal) Publisher：Asian Journal of Plant Sciences
Background and Objective: Indigenous legumes of Indonesia, such as jack bean (Canavalia ensiformis), offer promising potential as alternative sources of energy and protein in ruminant nutrition. This study aimed to determine the crude protein yield, total digestible nutrient yield and total tannin of jack bean (Canavalia ensiformis) plant at different growth stages cultivated in alluvial soil at Blora, Central Java, Indonesia. Materials and Methods: This study used a Completely Randomized Block Design (RCBD) with four replications in every stage. Sixteen jack bean seeds were sown in 1×1 m<sup>2</sup> plots. The following parameters observed were crude protein (CP) yield, Total Digestible Nutrient (TDN) yield and total tannins, which were measured at three distinct growth stages, the vegetative, flowering and pod setting stages before harvesting. Data were analyzed using Analysis of Variance (ANOVA) and continued with Duncan’s Multiple Range Test (p<0.05). Results: The growth stage had a significant effect (p<0.05) on the CP yield of leaves and stems. On the other hand, highly significant differences (p<0.01) were observed in the CP yield of stems, TDN yield of leaves, stems and total (leaves+stems) and total tannins. The CP yield of leaves and total yield increased significantly with advancing growth stages. Additionally, the CP yield of stems and TDN yield of leaves, stems and total yield increased very significantly with advancing growth stages. However, total tannins showed a highly significant decrease as the growth stage progressed. Conclusion: Harvesting at the pod-setting stage is the optimal stage for achieving the highest CP and TDN yields. On the other hand, total tannin content across all growth stages of jack bean plants is within safe levels for ruminant consumption.
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Ishigaki G., Niimi M., Shigedomi H., Sasaki Y., Idota S., Ishii Y.
Grassland Research 3 ( 4 ) 364 - 372 2024.12
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Grassland Research
Background: Pearl millet is characterized by its high dry matter (DM) yields with a high moisture content, which makes it difficult to process as silage. Methods: Pearl millet was sown in mid-September for 3 years to examine its growth, DM yields in early December, and decrease in DM percentage after frost exposure. The crop was processed as round-bale silage to assess silage quality and preference by breeding beef cattle. Results: Plants reached a height of 160–200 cm, with heading tiller percentages of 50%–70% in early December. With frost exposure, DM percentage increased in leaves and panicles, followed by stems, reaching over 40%, 1 month after exposure. These increases were positively correlated with cumulative frost exposure. After frost exposure, in vitro DM digestibility and crude protein content declined while acid detergent fiber content increased. Repeated cafeteria feeding experiments showed a reduced preference for either pearl millet silage or Italian ryegrass hay. The silage showed moderate acidity at pH 4.73–5.40, with lactic acid at 0.58%–1.62% DM, acetic acid at 0.03%–0.10% DM, and negligible butyric acid, indicating a satisfactory quality. Conclusions: In Southern Kyushu, pearl millet sown in late summer can be processed into low-moisture round-bale silage in January, the year following sowing.
DOI： 10.1002/glr2.12096
Books 【 display / non-display 】
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牧草と園芸：飼料用トウモロコシに対するツマジロクサヨトウ防除の取り組みについて
石井康之、井戸田幸子、石垣元気（ Role： Joint author）
雪印種苗 2021.5
Responsible for pages：400-405 Language：Japanese
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植調：暖地型イネ科牧草ウロクロア属草種の西南暖地への導入および栽培
石垣元気（ Role： Sole author）
日本植物調節剤研究協会 2019.11
Language：Japanese
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平成29年度食肉に関する助成研究調査成果報告書 西南暖地におけるイネ科牧草リビングマルチ体系による飼料用ダイズ生産技術の開発（Ⅱ）
石垣元気・荒井昌和・福山喜一（ Role： Joint author）
公益財団法人伊藤記念財団 2017.11
Responsible for pages：400-405 Language：Japanese Book type：Report
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平成29年度食肉に関する助成研究調査成果報告書 西南暖地におけるイネ科牧草リビングマルチ体系による飼料用ダイズ生産技術の開発（Ⅱ）
石垣元気, 荒井昌和, 福山喜一
公益財団法人伊藤記念財団 2017.11
Responsible for pages：400-405 Language：Japanese
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平成28年度食肉に関する助成研究調査成果報告書 西南暖地におけるイネ科牧草リビングマルチ体系による飼料用ダイズ生産技術の開発
石垣元気・福山喜一（ Role： Joint author）
公益財団法人伊藤記念財団 2016.11
Responsible for pages：351-355 Language：Japanese Book type：Report
Presentations 【 display / non-display 】
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Preference of forage soybean for livestock in southern Kyushu
2025.3.17
Event date： 2025.3.17 - 2025.3.19
Language：Japanese Presentation type：Oral presentation (general)
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不耕起播種機を用いない飼料用ダイズ不耕起播種法の検討
荒巻卓郎・石垣元気
日本草地学会 2025.3.17
Event date： 2025.3.17 - 2025.3.19
Language：Japanese Presentation type：Poster presentation
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黄色灯照射が飼料用トウモロコシの生育程度および収量に及ぼす影響
石垣元気・酒井貴志・安達鉄矢
日本草地学会 2022.3
Event date： 2022.3
Language：Japanese Presentation type：Oral presentation (general)
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LEDライトトラップを用いた飼料用ダイズの主要害虫管理技術に関する基礎的研究
石垣元気・高橋京史・Yogi Sidik Prasojo・明石 良
日本草地学会 2021.3
Event date： 2021.3
Language：Japanese Presentation type：Oral presentation (general)
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飼料用ダイズの多回刈り技術に関する基礎的研究
石垣元気・Yogi Sidik Prasojo・橋口正嗣・明石 良
日本草地学会 2020.3
Event date： 2020.3
Language：Japanese Presentation type：Oral presentation (general)
Awards 【 display / non-display 】
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日本草地学会研究奨励賞
2015.3 日本草地学会
石垣元気
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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フィールドにおける複数草種のデジタル独立計測と新しい牧草の混播栽培技術の確立
Grant number：25K09408 2025.04 - 2028.03
独立行政法人日本学術振興会 科学研究費基金 基盤研究(C)
Authorship：Coinvestigator(s)
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西南暖地における飼料用ダイズの多回刈り技術の基礎的研究ー刈り取り高さと踏圧回数ー
Grant number：19K06000 2019.04 - 2024.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
Available Technology 【 display / non-display 】
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暖地型牧草ルジグラスにおける四倍体系統の育成とその育種的利用に関する研究
西南暖地における新規導入牧草の栽培・利用に関する研究
飼料用ダイズ生産技術の開発に関する研究Home Page： 宮崎大学農学部附属フィールド科学教育研究センター住吉フィールド（牧場）
Related fields where technical consultation is available：牧草生産，飼料生産
Message：・共同研究の希望テーマ：高タンパク質・高消化性に焦点をあてた暖地型イネ科牧草の品種改良
・飼料用ダイズ生産を家畜生産に取り入れてみたい自治体等があればご連絡ください。