CHIZU — the atlas of coffee research
Coffee research in Spain
Two limits come with this count. Only 100,474 of the 190,643 searchable papers (52.7%) carry an author affiliation country. The other 90,169 (47.3%) carry none. So these 2,363 papers are 2,363 out of the 100,474 whose affiliation is known. And a co-authored paper is counted once for every country its authors sit in. Per-country counts therefore do not add up to the whole.
Spain does not grow coffee, but coffee is researched there.
Check it yourself
This is not our word for it. You can run the same query against the same index.
When they were written
1966–2026
Years before 1600 are treated as unknown. The upstream data (OpenAlex) sometimes writes 1400 when the year is missing, and that is a placeholder, not a measurement.
Where they appeared
Top 8 sources (journals and repositories)
Most cited
10 papers, most cited first
- Global trends in hepatocellular carcinoma epidemiology: implications for screening, prevention and therapy2023cited 863
- A meta‐analysis of coffee drinking, cigarette smoking, and the risk of Parkinson's disease2002cited 813
- Universal physical responses to stretch in the living cell2007cited 717open access
- The coffee genome provides insight into the convergent evolution of caffeine biosynthesis2014cited 666open access
- Do fair trade and eco-labels in coffee wake up the consumer conscience?2005cited 663
- Tracing the impact of the Andean uplift on Neotropical plant evolution2009cited 658open access
- Properties of biochar derived from wood and high-nutrient biomasses with the aim of agronomic and environmental benefits2017cited 641open access
- Risk factors for hip fracture in european women: The MEDOS study1995cited 570
- Use of biochar as bulking agent for the composting of poultry manure: Effect on organic matter degradation and humification2009cited 503open access
- Dietary patterns, foods and nutrients in male fertility parameters and fecundability: a systematic review of observational studies2017cited 489open access
Which stage of coffee
Only 30.2% of the whole index carries a stage label. Of this country's 2,363 papers, 967 carry one. The breakdown below is about those 967 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
Which field
Only 75.9% of the whole index carries a field label. Of this country's 2,363 papers, 1,922 carry one. The breakdown below is about those 1,922 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
What language
"undetermined" means the upstream record carried no language. We did not guess one.
Knowledge is not evenly spread
Counting only papers whose author affiliation is known, the largest is Indonesia with 22,248. Spain has 2,363 — a factor of 9.
That gap does not follow where coffee is grown. Research gathers where the means to do research are, not where the coffee is. Making that visible is why CHIZU exists.
Other countries
Indonesia 22,248United States 17,988Brazil 10,857United Kingdom 5,569China 4,887India 3,542Germany 3,185Italy 3,111France 3,072Japan 2,822Colombia 2,489Canada 2,352