Data Sources and Citation Metrics
The 5th edition of the Research.com Best Plant Science and Agronomy Scientists in Norway Ranking is primarily based on comprehensive bibliometric data drawn from established and reputable sources, including OpenAlex, CrossRef, and multiple additional databases. These sources collectively provide a robust foundation for compiling accurate and up-to-date publication and citation records. The data used to derive citation-based metrics were collected on January 12, 2026, ensuring currency and relevance in the evaluation process.
A scientist’s position within the ranking is determined by their D-index (Discipline H-index), a refined bibliometric indicator that accounts solely for papers and citations within the examined discipline—Plant Science and Agronomy in this case. This metric allows for a focused assessment of scholarly impact specific to the discipline rather than general scientific output.
Scope of Research and Eligibility Criteria
The foundation of this ranking involved examining 279,971 scientist profiles identified from a diverse array of bibliometric data sources covering all academic disciplines. Specifically, 13 scientists in the domain of Plant Science and Agronomy based in Norway were carefully analyzed. To qualify for inclusion, candidates were required to meet a minimum D-index threshold of 30 and demonstrate that the majority of their tier publications were concentrated within Plant Science and Agronomy. Additionally, distinguished awards and achievements relevant to the field were factored into the selection process.
The D-index threshold is not static but varies incrementally by 10, calibrated according to the estimated total number of scholars within each discipline. This adaptive threshold ensures that only the top ~1% of leading researchers are incorporated, maintaining the exclusivity and prestige of the list. Furthermore, to strengthen disciplinary relevance, the ranking enforces a constraint whereby the disparity between a scientist’s overall H-index and their discipline-specific D-index does not exceed 30%.
Verification and Validation Procedures
Recognizing that raw bibliometric data cannot serve as an absolute measure of scholarly output, the Research.com team has incorporated rigorous manual verification methods alongside computational analyses. Each scientist’s profile underwent meticulous cross-verification against publications documented in a broad spectrum of trustworthy sources. Although the number of publications in prominent journals and conference proceedings does not directly influence the D-index-based ranking position, it is acknowledged as a valuable secondary indicator of a researcher’s substantial contributions within the scientific community.
The position of each scientist in the ranking is ultimately established using their D-index as obtained from OpenAlex and CrossRef—two of the most authoritative and widely utilized bibliometric databases available to researchers today. For a more detailed understanding of the methodology applied, we invite readers to consult our methodology page.
Research.com’s Mission and Vision
The overarching mission behind the creation of the Research.com rankings is to motivate researchers, companies, and policymakers worldwide to closely observe trends and directions pursued by leading experts. The ranking provides the global scientific community with a reliable and transparent means to identify top specialists within specific areas of study, across countries, and even within individual research institutions. Through these efforts, Research.com aims to foster greater recognition, collaboration, and informed decision-making that advance scientific progress on both national and international scales.
