Internet Search Engine Search Results
Haddaway et al. What are the effects of agricultural management on soil organic carbon (SOC)
stocks? A systematic map.
Google (www.google.com), 17 March 2014
(carbon AND sequestration AND soil AND agriculture)
1,820,000 hits, 100 most relevant checked
5 potentially relevant articles recorded (articles relevant at abstract level but not found in publication
databases)
3 further articles were found after snowballing reference lists.
Google Scholar (scholar.google.com), 17 March 2014
English: (carbon AND sequestration AND soil AND agriculture)
70,400 hits, 100 most relevant checked
No potentially relevant article that was not previously recorded. 83 of 100 articles were already
found in publication databases.
Google Scholar (scholar.google.com), 15 April 2014
German: (kohlenstoff AND lagerung AND boden AND landwirt)
3,610 hits, 150 most relevant checked
2 potentially relevant articles recorded (articles relevant at abstract level but not found in publication
databases)
Google Scholar (scholar.google.com), 29 April 2014
Italian: (carbonio AND stoccaggio AND suolo AND agricoltura)
1,840 hits, 100 most relevant checked
1 potentially relevant article recorded (articles relevant at abstract level but not found in publication
databases)
Google Scholar (scholar.google.com), 20 May 2014
French: (carbone AND stockage AND terre AND agriculture)
1,190 hits, 100 most relevant checked
3 potentially relevant articles recorded (articles relevant at abstract level but not found in publication
databases)
Google Scholar (scholar.google.com), 7 May 2014
Danish: (kulstof AND indhold AND jord AND landbrug)
1,840 hits, 100 most relevant checked
2 potentially relevant articles recorded (articles relevant at abstract level but not found in publication
databases)
Google Scholar (scholar.google.com), 28 April 2014
Swedish: (kol AND lagring AND mark AND jordbruk)
1,160 hits, 100 most relevant checked
1 potentially relevant article recorded (articles relevant at abstract level but not found in publication
databases)
Dogpile (www.dogpile.com) (search results from Google and Yahoo)
(carbon AND sequestration AND soil AND agriculture)
Unknown number of hits (information not given), 100 most relevant checked
2 potentially relevant articles at abstract level that was not previously recorded.
Scirus (www.scirus.com)
No search was made. Search engine retired on January 30, 2014 (after publication of
the Protocol).