Keiichi Hayashi

467 total citations
34 papers, 334 citations indexed

About

Keiichi Hayashi is a scholar working on Plant Science, Soil Science and Ecology, Evolution, Behavior and Systematics. According to data from OpenAlex, Keiichi Hayashi has authored 34 papers receiving a total of 334 indexed citations (citations by other indexed papers that have themselves been cited), including 18 papers in Plant Science, 13 papers in Soil Science and 11 papers in Ecology, Evolution, Behavior and Systematics. Recurrent topics in Keiichi Hayashi's work include Soil Carbon and Nitrogen Dynamics (11 papers), Rice Cultivation and Yield Improvement (10 papers) and Climate change impacts on agriculture (6 papers). Keiichi Hayashi is often cited by papers focused on Soil Carbon and Nitrogen Dynamics (11 papers), Rice Cultivation and Yield Improvement (10 papers) and Climate change impacts on agriculture (6 papers). Keiichi Hayashi collaborates with scholars based in Japan, Philippines and Niger. Keiichi Hayashi's co-authors include Ruth Agbisit, Toshiyuki Wakatsuki, Satoshi Tobita, Prihasto Setyanto, Ryoichi Matsunaga, Tsugiyuki Masunaga, Kensuke Okada, Ramadjita Tabo, Tahirou Abdoulaye and Daisuke Kubota and has published in prestigious journals such as The Science of The Total Environment, Agriculture Ecosystems & Environment and Geoderma.

In The Last Decade

Keiichi Hayashi

34 papers receiving 318 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Keiichi Hayashi Japan 11 180 104 83 45 38 34 334
Gonzalo Carracelas Uruguay 5 189 1.1× 75 0.7× 69 0.8× 33 0.7× 21 0.6× 9 306
V. Seng Cambodia 11 242 1.3× 150 1.4× 140 1.7× 26 0.6× 46 1.2× 49 380
Michel P. Sédogo Burkina Faso 11 124 0.7× 104 1.0× 141 1.7× 56 1.2× 20 0.5× 37 355
Brajendra Parmar India 12 167 0.9× 197 1.9× 40 0.5× 79 1.8× 41 1.1× 31 402
Rebecca Zengeni South Africa 9 239 1.3× 138 1.3× 34 0.4× 132 2.9× 49 1.3× 33 411
Elżbieta Wójcik‐Gront Poland 11 194 1.1× 66 0.6× 29 0.3× 93 2.1× 29 0.8× 55 350
Paul Salon United States 7 119 0.7× 117 1.1× 62 0.7× 87 1.9× 40 1.1× 11 336
K P C Rao India 10 173 1.0× 227 2.2× 43 0.5× 88 2.0× 33 0.9× 27 382
Niraj Kumar India 5 128 0.7× 37 0.4× 57 0.7× 22 0.5× 33 0.9× 14 287
John M. Orlowski United States 12 461 2.6× 117 1.1× 44 0.5× 104 2.3× 57 1.5× 26 570

Countries citing papers authored by Keiichi Hayashi

Since Specialization
Citations

This map shows the geographic impact of Keiichi Hayashi's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Keiichi Hayashi with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Keiichi Hayashi more than expected).

Fields of papers citing papers by Keiichi Hayashi

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Keiichi Hayashi. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Keiichi Hayashi. The network helps show where Keiichi Hayashi may publish in the future.

Co-authorship network of co-authors of Keiichi Hayashi

This figure shows the co-authorship network connecting the top 25 collaborators of Keiichi Hayashi. A scholar is included among the top collaborators of Keiichi Hayashi based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Keiichi Hayashi. Keiichi Hayashi is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Kawakami, Norifumi, et al.. (2025). Method for Accurately Assessing the Impact of Enzyme Encapsulation in a Protein Nanocage. Nano Select. 6(10). 1 indexed citations
2.
Kawakami, Norifumi, et al.. (2023). Column-free purification of an artificial protein nanocage, TIP60. Protein Expression and Purification. 205. 106232–106232. 2 indexed citations
3.
Kinose, Yoshiyuki, et al.. (2019). Impact assessment of climate change on the major rice cultivar Ciherang in Indonesia. Journal of Agricultural Meteorology. 76(1). 19–28. 17 indexed citations
4.
Hayashi, Keiichi, et al.. (2017). Evaluation of fertilizer and water management effect on rice performance and greenhouse gas intensity in different seasonal weather of tropical climate. The Science of The Total Environment. 601-602. 1254–1262. 42 indexed citations
5.
6.
Matsunaga, Ryoichi, et al.. (2016). Long‐Term Effects of Fertilizer and Organic Matter Application on Millet in Niger. Agronomy Journal. 108(2). 873–883. 8 indexed citations
7.
Hayashi, Keiichi, et al.. (2016). Effect of rates and sources of nitrogen on rice yield, nitrogen efficiency, and methane emission from irrigated rice cultivation. Archives of Agronomy and Soil Science. 63(7). 1009–1022. 11 indexed citations
8.
Nakamura, Satoshi, Keiichi Hayashi, Dougbédji Fatondji, et al.. (2012). Rothamsted carbon model reveals technical options to maintain soil organic carbon under semi-arid climate. Agronomy for Sustainable Development. 32(4). 865–872. 5 indexed citations
9.
10.
Hayashi, Keiichi, Tahirou Abdoulaye, Hitoshi Shinjo, et al.. (2012). Estimation of nitrogen flow within a village-farm model in Fakara region in Niger, Sahelian zone of West Africa. Nutrient Cycling in Agroecosystems. 92(3). 289–304. 5 indexed citations
11.
Iijima, Takashi, Keiichi Hayashi, & Kenichi Uemura. (2012). Functional Materials (Chemical Edition). 1 indexed citations
12.
Hayashi, Keiichi, Tahirou Abdoulaye, Ryoichi Matsunaga, & Satoshi Tobita. (2009). Appraisal of Local Farmers' Practices on Land Management for a Guideline of Agricultural Development in the Sahel Zone of Niger, West Africa. Japan Agricultural Research Quarterly JARQ. 43(1). 63–69. 5 indexed citations
13.
Hayashi, Keiichi, Tahirou Abdoulaye, & Toshiyuki Wakatsuki. (2009). Evaluation of the utilization of heated sewage sludge for peri-urban horticulture production in the Sahel of West Africa. Agricultural Systems. 103(1). 36–40. 5 indexed citations
14.
Matsunaga, Ryoichi, et al.. (2008). Yield Performance, Nitrogen and Phosphorus Acquisition of Cowpea Germplasm Accessions in Low-Fertile Sandy Soils in the Sahelian Zone. Tropical agriculture and development. 52(2). 50–57. 1 indexed citations
15.
Shinjo, Hitoshi, et al.. (2008). Management of Livestock Excreta through Corralling Practice by Sedentary Pastoralists in the Sahelian Region of West Africa. Tropical agriculture and development. 52(4). 97–103. 5 indexed citations
16.
Matsunaga, Ryoichi, et al.. (2008). Applicability of phosphate buffer extractable organic nitrogen as an indicator of available nitrogen in the sandy soils of the Sahel zone of Niger, West Africa. Soil Science & Plant Nutrition. 54(3). 449–458. 5 indexed citations
17.
Matsunaga, Ryoichi, et al.. (2006). Cowpea Cultivation in the Sahelian Region of West Africa: Farmers' Preferences and Production Constraints. Nettai Nogyo/Nettai nougyou. 50(4). 208–214. 3 indexed citations
18.
19.
Kubota, Daisuke, et al.. (2001). Effect of a Sawah-Based Farming System on Rice Cultivation in the Inland Valley Bottom of the Ashanti Region, Ghana.. Tropics. 10(4). 555–564. 6 indexed citations
20.
TERAI, Hirofumi, Keiichi Hayashi, Masashi Mizuno, & Hironobu Tsuchida. (1999). Comparison of Changes in Ethylene and Polyamines of Water Convolvulus and Chingensai Exposed to Chilling Stress.. Food Science and Technology Research. 5(1). 64–68. 1 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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