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Table 1 Critical appraisal criteria

From: How does tillage intensity affect soil organic carbon? A systematic review protocol

Variable Value Score
Spatial (true) replication 2 replicates 0
  3–4 replicates 1
  >4 replicates 2
Temporal replication ≤3 replicates 0
  4–6 replicates 1
  >6 replicates 2
Treatment allocation (as described for the full experimental design) Purposive (selective) 0
  Split-/strip-plot/latin square/blocked/randomised/exhaustive 2
Duration of experiment 10–19 years 0
  20–29 years 1
  ≥30 years 2
Soil sampling depth Shallow (maximum depth ≤15 cm) single or multiple sampling 0
  Plough layer (maximum depth 15–25 cm) single or multiple sampling, or deep (maximum depth >25 cm) single sampling 1
  Multiple deep sampling (maximum depth >25 cm) 2