CHIZU — the atlas of coffee research
Coffee research in Nigeria
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 407 papers are 407 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.
Nigeria is a coffee-producing country.
Check it yourself
This is not our word for it. You can run the same query against the same index.
When they were written
1964–2026
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
- Effective removal of anionic textile dyes using adsorbent synthesized from coffee waste2020cited 419open access
- Quantile risk spillovers between energy and agricultural commodity markets: Evidence from pre and during COVID-19 outbreak2022cited 264
- Substance use among secondary school students in an urban setting in Nigeria: prevalence and associated factors2010cited 191open access
- Trace heavy metals composition of some Nigerian beverages and food drinks1999cited 189
- Bioactive Micronutrients in Coffee: Recent Analytical Approaches for Characterization and Quantification2014cited 145open access
- Coffee, caffeine, chlorogenic acid, and the purinergic system2018cited 138open access
- Substance use among adolescents in sub-Saharan Africa: a systematic review and meta-analysis2018cited 138open access
- Coffee seed physiology2006cited 132open access
- Recent advances in caffeine and theobromine toxicities: a review1997cited 120
- Cyclotide discovery in Gentianales revisited—identification and characterization of cyclic cystine‐knot peptides and their phylogenetic distribution in Rubiaceae plants2013cited 107open access
Which stage of coffee
Only 30.2% of the whole index carries a stage label. Of this country's 407 papers, 173 carry one. The breakdown below is about those 173 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 407 papers, 342 carry one. The breakdown below is about those 342 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. Nigeria has 407 — a factor of 55.
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 2,489Spain 2,363