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Table 5 The number of studies included in the systematic map investigating crop rotation interventions

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

InterventionNo. of studies
Monoculture vs: 
 Unspecified1
 Complex rotation (4 years)32
 Rotations involving perennials27
 2 or 3 years rotations105
 Rotations involving 1 year “perennials”26
  Sewn fallow or grass26
  Chemical or bare fallow4
 Comparison of different crops 
  Unspecified1
  Legumes ± or legumes vs legumes144
  Grass/hay/green fallow± or vs. each other20
  Only crops32
 Annual crop vs. perennial crop (2 years or more)61
  Unspecified 
 Multi cropping20
  Under-sown/intercropping (legumes or other) 
  Double cropping28
  Cover- or catch crops17
 Energy crops 
  Energy crops vs. energy crops9
  Energy crops vs. other crops7
 Simple rotation (2 year) vs. complex rotations (3 years or more)46
Total240
  1. Interventions are catalogued in a hierarchical way, such that column one is the rotation with which columns two and three are compared. Column three details more specific sub-categories from within the category in the preceding column