Data Sources and Metric Basis of the Ranking
The 5th edition of the Research.com Best Plant Science and Agronomy Scientists in Japan Ranking is constructed primarily using comprehensive bibliometric data sourced from OpenAlex and CrossRef, supplemented by multiple other authoritative data sources. These extensive datasets served as the foundational inputs for generating citation-based metrics that form the core quantitative basis of this ranking. The bibliometric data underpinning the citation metrics were collected on January 12, 2026, ensuring the most current and accurate reflection of scholarly impact at the time of analysis.
A scientist’s standing within the ranking is determined by their D-index (Discipline H-index), an adapted h-index metric which exclusively considers publications and citations within the specific discipline under examination—in this case, Plant Science and Agronomy. This approach allows for precise evaluation of researchers’ contributions strictly within their relevant field, avoiding inflation from unrelated disciplines.
Scope of Research and Eligibility Criteria
The ranking methodology commenced with a comprehensive examination of 279,971 scientist profiles drawn from an array of bibliometric datasets spanning all scientific disciplines globally. Specifically within Plant Science and Agronomy, 280 scientists' profiles were scrutinized to ascertain high-impact researchers in this domain.
To qualify for inclusion in this ranking, a scientist was required to meet the following criteria:
- A minimum D-index threshold of 30, indicating a substantial citation impact exclusively in Plant Science and Agronomy publications.
- A majority of their tier publications must be attributed to the Plant Science and Agronomy field, ensuring focused expertise.
- Consideration of notable awards and distinguished achievements within the discipline of Plant Science and Agronomy.
The D-index threshold for considering leading researchers is set in increments of 10, calibrated according to the estimated total population of scholars per discipline. This dynamic thresholding ensures representation of the top 1% of researchers in each field. Additionally, to maintain domain-specific relevance, candidate profiles exhibit a proximity margin of no greater than 30% difference between their overall general h-index and their D-index.
Additional Verification and Assessment Practices
The Research.com team recognizes that bibliometric data alone cannot serve as an absolute gauge of scholarly output. Accordingly, all scientist profiles included in the ranking underwent meticulous manual verification. Profiles were cross-correlated against multiple trustworthy sources of publication records, ensuring accurate attribution and validation of research contributions.
While the ranking position is derived strictly from the D-index based on data from OpenAlex and CrossRef—widely acknowledged as the most comprehensive and reputable bibliometric databases—secondary indicators such as the number of publications in prominent journals and conference proceedings were also examined. Though not factored directly into the ranking score, these indicators provide valuable contextual insight into a scientist’s research productivity and engagement within the scholarly community.
For rigorous transparency and further details on the methodologies employed, readers are encouraged to consult our methodology page.
Research.com’s Mission Behind the Ranking
The primary mission behind the creation of the Research.com ranking is to motivate researchers, industry leaders, and policymakers globally to observe emerging research trajectories and developments. By highlighting the leading experts within specific fields such as Plant Science and Agronomy, and within geographic and institutional contexts, this ranking facilitates greater visibility and recognition of scientific excellence.
Research.com aims to provide the entire scientific community—including academic institutions, funding bodies, and governmental organizations—with a credible and meticulously researched platform to identify and engage with top-tier talent driving innovation and knowledge advancement across the globe.
