Data Sources and Ranking Metric
The 5th edition of the Research.com Best Plant Science and Agronomy Scientists in South Africa Ranking is primarily based on bibliometric data aggregated from OpenAlex and CrossRef, supplemented with multiple other reputable data sources. This comprehensive approach provided a robust dataset for the compilation of the ranking. The bibliometric data, which underpin the citation-based metrics used, were collected on January 12, 2026.
A scientist’s placement within the ranking is determined by their D-index (Discipline H-index). The D-index is a specialized adaptation of the traditional H-index that accounts only for publications and citations relevant to the specific discipline under examination—in this case, Plant Science and Agronomy. This focus ensures that the ranking reflects domain-specific impact rather than generalized research output.
Scope and Qualification Criteria of the Ranking
The ranking process commenced with the examination of 279,971 scientist profiles identified across a multitude of bibliometric data sources covering all academic disciplines. From this extensive pool, 50 scientists specializing in Plant Science and Agronomy within South Africa were specifically assessed.
To qualify for inclusion in the ranking, a scientist was required to have a minimum D-index of 30. Additionally, the majority of the scientist’s tier publications had to be focused on Plant Science and Agronomy. Recognition of awards and achievements within this field also contributed to the evaluation process.
The threshold for the D-index is calibrated incrementally by 10-point steps depending on the total estimated number of scholars in each discipline. This ensures that the ranking consistently incorporates the top 1% of leading experts within their respective fields. Furthermore, candidates must exhibit a proximity of 30% or less between their general H-index and their discipline-specific D-index, reinforcing the relevance of their expertise to Plant Science and Agronomy.
Additional Verification Practices
Recognizing the limitations of relying solely on raw bibliometric data, the research team conducted rigorous manual verification of all scientist profiles considered for the ranking. Profiles were cross-correlated against publications indexed in an array of trustworthy sources to ensure accuracy and completeness.
While the number of papers published in prominent journals and conference proceedings is not directly factored into a scientist’s ranking position, it remains a valuable secondary measure illustrating a researcher’s active contribution to their field.
The definitive position of each scientist is derived using their D-index as calculated based on data compiled from OpenAlex and CrossRef, two of the most prominent and respected bibliometric databases accessible to the research community. For detailed information concerning the methodology employed, readers are encouraged to visit our methodology page.
Research.com’s Mission and Vision
Research.com is dedicated to motivating researchers, organizations, and policymakers worldwide to closely follow the trajectories and contributions of leading experts. Our objective is to provide the global scientific community with a transparent, reliable resource to identify top researchers within specialized disciplines, across diverse countries, and even within individual institutions.
This ranking exemplifies our meticulous approach to fostering awareness and collaboration by recognizing scientific excellence. Through this work, we aim to accelerate scientific discovery and informed decision-making across the Plant Science and Agronomy research landscape in South Africa and beyond.
