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Table 4 The number of studies included in the systematic map investigating amendment interventions

From: What are the effects of agricultural management on soil organic carbon in boreo-temperate systems?

InterventionNo. of studies
Crop residue31
 Unspecified4
 Composted40
 Uncomposted 
  Green (mulch)16
  Yellow36
  Burned18
Manure 
 Unspecified63
 Liquid (slurry)18
 Solid112
  Cattle9
  Poultry3
  Composted14
Lime9
Sewage sludge17
Green manure24
Peat/sediment10
Domestic compost/waste4
Processed wood (sawdust/woodchips)8
Different application methods1
Bone meal/animal products1
  1. Interventions are catalogued in a hierarchical way, such that column one is broad intervention groups, whilst columns two and three are more specific sub-categories from within the category in the preceding column