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Table 1 Number of studies investigating different crop rotation impacts on soil organic carbon in systematic map

From: How do selected crop rotations affect soil organic carbon in boreo-temperate systems? A systematic review protocol

Review questiona Number of studies Number of studies with data for meta-analysis
Crop rotations-vs-monocultures (1.1) 132 62
Rotations with-vs-without legumes (1.2.1) 138 71
Rotations with perennials-vs-annuals (1.3) 60 29
  1. aCodes within parenthesis refer to categories used in the systematic map by Haddaway et al. [26]