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Table 1 Search specifications and string for each database or search engine

From: What is the impact of human wastewater biosolids (sewage sludge) application on long-term soil carbon sequestration rates? A systematic review protocol

Database or search engine name (Abbrev.) Search field specification Search string Search dates
Bibliographic databases
 CAB Abstracts from CAB Direct All fields (does not have a “Topic” field) (soil) AND (carbon OR “soil OC” OR SOC OR “soil organic C” OR “soil organic carbon” OR “organic matter” OR “soil OM” OR SOM OR “soil organic matter”) AND (biosolid* OR sewage OR sludge OR “sewage sludge” OR biosludge OR milorganite OR “human solid waste” OR “waste amend*”) All years (1915–present)
 ProQuest Dissertations & Theses Global Abstract ab(soil) AND ab(carbon OR "soil OC" OR SOC OR "soil organic C" OR "soil organic carbon" OR "organic matter" OR "soil OM" OR SOM OR "soil organic matter") AND ab(biosolid* OR sewage OR sludge OR "sewage sludge" OR biosludge OR milorganite OR "human solid waste" OR "waste amend*") 1637–present, full-text dissertations 1997–present
 Scopus Article title, Abstract, and Keywords ( TITLE-ABS-KEY ( soil) AND TITLE-ABS-KEY ( carbon OR "soil OC" OR SOC OR "soil organic C" OR "soil organic carbon" OR "organic matter" OR "soil OM" OR SOM OR "soil organic matter") AND TITLE-ABS-KEY ( biosolid* OR sewage OR sludge OR "sewage sludge" OR biosludge OR milorganite OR "human solid waste" OR "waste amend*")) All years (1800s–present)
Web of Science from Clarivate Analytics, Core Collection Topic (titles, authors, abstracts, keywords) TOPIC: (soil) AND TOPIC: (carbon OR "soil OC" OR SOC OR "soil organic C" OR "soil organic carbon" OR "organic matter" OR "soil OM" OR SOM OR "soil organic matter") AND TOPIC: (biosolid* OR sewage OR sludge OR "sewage sludge" OR biosludge OR milorganite OR "human solid waste" OR "waste amend*") All years (1900–present)
Search Engines
 Google Scholar search query in Harzing’s Publish or Perish 256-character limit (No field category) soil (carbon|"soil OC"|SOC|"soil organic C"|"soil organic carbon"|"organic matter"|"soil OM"|SOM|"soil organic matter")(biosolids|sewage|sludge|"sewage sludge"|biosludge|milorganite|"human solid waste"|"waste amendment") First 1000 results sorted by relevance according to Google Scholar’s algorithm
 Microsoft Academic search query in Harzing’s Publish or Perish Keywords soil AND (carbon OR "soil OC" OR SOC OR "soil organic C" OR "soil organic carbon" OR "organic matter" OR "soil OM" OR SOM OR "soil organic matter") AND (biosolids OR sewage OR sludge OR "sewage sludge" OR biosludge OR milorganite OR "human solid waste" OR "waste amendment") First 1000 results sorted by relevance according to Microsoft Academic’s algorithm