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Faculty of Agriculture Field Science Center |
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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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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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Ishigaki G., Niimi M., Shigedomi H., Sasaki Y., Idota S., Ishii Y.
Grassland Research 3 ( 4 ) 364 - 372 2024.12
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
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Niimi M., Kurata M., Ishigaki G., Ishii Y.
OnLine Journal of Biological Sciences 25 ( 1 ) 125 - 133 2024
Publishing type：Research paper (scientific journal) Publisher：OnLine Journal of Biological Sciences
Underutilization of bamboo contributes to the degradation of woody environments in southern Kyushu, Japan. A novel approach to using bamboo involves processing it to finely ground silage, although this product has shown inferior digestibility and palatability compared to traditional forage crops. This study evaluated the chemical composition, fermentation quality, and aerobic stability of silages produced from Italian ryegrass, maize, and Rhodes grass mixed with 10% (v/v) bamboo silage, ensiled for 30-40 days. One-day wilted first-cut Italian ryegrass and Rhodes grass and direct-cut maize were finely chopped, mixed with bamboo silage at a 9:1 volume ratio, and vacuum-sealed in polyethylene bags, with control silages produced without bamboo addition. Digestibility tended to decrease in bamboo-mixed maize and Rhodes grass silages. The addition of bamboo silage resulted in a significant decrease (p<0.05) in pH by 0.45 in Italian ryegrass, a trend toward lower pH in Rhodes grass, and a tendency for pH to increase in maize. Fermentation quality was improved by the addition of bamboo silage in Italian ryegrass and Rhodes grass, with significant increases (p<0.05) in contents of lactic acid by 2.91% Dry Matter (DM) and acetic acid by 1.03% DM, respectively, contrasting with a trend toward reduced lactic acid content in maize. Aerobic stability, measured as the time to reach a temperature increase of >2°C above ambient, was highest in Italian ryegrass silage with bamboo, which maintained stability for more than 6 days after air exposure, compared to significant temperature rises detected at 15 and 29 h in maize and Rhodes grass silages, respectively. Fermentation quality, including pH, lactic acid, and acetic acid contents, was maintained in Italian ryegrass silage mixed with bamboo for a week after air exposure, while rapid deterioration was observed in maize and Italian ryegrass silages with and without bamboo silage addition. It is concluded that wilted Italian ryegrass mixed with 10% bamboo silage may enhance the handling efficiency of silage after opening silos in early June for the site in southern Kyushu, Japan.
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Tiller Number and Flowering Ability on BC1F1 Progeny of Interspecific Hybridization in Ruzigrass (Urochloa ruziziensis) Reviewed International coauthorship
Sidik Prasojo Y., Nitthaisong P., Muguerza M., Kamphayae S., Umami N., Ishigaki G.
BIO Web of Conferences 80 2023.12
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：BIO Web of Conferences
The objective of this study focusing on production BC1F1 progeny of interspecific hybridization in ruzigrass (Urochloa ruziziensis) were to evaluate potential of pentaploid BC1F1 hybrid for seed propagation by associating with their tiller number, flowering, and shattering ability. In addition, we evaluate the function of various nitrogen dose on vegetative stages. Eight different genotypes were examined: B. ruziziensis 'Kennedy', B. decumbens 'Basilisk', pentaploid BC1F1 line derived from B. ruziziensis and Mulato (RM), pentaploid BC1F1 line derived from diploid B. ruziziensis and tetraploid B. ruziziensis (RR), and pentaploid BC1F1 lines derived from B. ruziziensis and B. decumbens (RD 1-4). The experimental plants treated with three level of nitrogen fertilizer (0, 4, and 8 kg/10a). Compared with parental line, RM line had high tiller number along with increasing level of nitrogen. For the flowering and shattering ability, the first lines to flowered and shattered was the pentaploid BC1F1 (RD 1-4), RR, and B. decumbens. Pentaploid BC1F1 lines derived from B. ruziziensis and B. decumbens (RD 1-4) had potential for seed propagation by associating with their flowering and shattering ability, while pentaploid BC1F1 line derived from B. ruziziensis and Mulato (RM) had the potential biomass production and yield ability by associating with its tiller number production.
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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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)
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シリカ材添加条件下における家畜排泄物の臭気低減に関する研究
石垣元気・小林郁雄
日本草地学会 2019.3
Event date： 2019.3
Language：Japanese Presentation type：Oral presentation (general)
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Genetic, breeding and physiology of tropical forage Invited International conference
Genki Ishigaki
2018.7
Event date： 2018.7
Language：English 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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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。