The data above were extracted from the Essential Science
Indicators database of Clarivate. This database, currently
covering the period January 1998 through August 2008, surveys only journal
articles (original research reports and review articles) indexed by Thomson
Reuters. Articles are assigned to a category based on the journals in which
they were published and Clarivate’s journal-to-category field
definition scheme. Both articles tabulated and citation counts to those
articles are for the period indicated. Naturally, institutions publishing
large numbers of papers have a greater likelihood of collecting more
citations than those publishing fewer papers. This ranking is by citations
per paper (impact), among those institutions that have collected 5,000 or
more citations in agricultural sciences. For papers with multiple
institutional addresses, each institution receives full, not fractional,
citation credit. Essential Science Indicators lists institutions
ranked in the top 1% for a field over a given period, based on total
citations. For the current version, 394 institutions are listed in the
field of agricultural sciences, meaning that a total of 39,400 institutions
were reviewed to obtain these results. Of the 394, 42 institutions
collected 5,000 or more citations. The ranking by citations per paper
(impact) seeks to reveal “heavy-hitters” based on per paper
influence, not mere output.