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Table 10 Commonly missing meta-data and data from the evidence base within this review

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

Missing information

No. of studies

% of evidence

Description

Soil description

37

11

Studies lacking any description of soil type

Study duration

1

0.3

Study lacks any description of how long the experiments lasted

Study timing

20

6

Studies lacking information on when the experiments started and ended

Study design

29

8

Studies lacking information about the experimental design (i.e. randomisation, blocking, split-plot, strip-plot, latin square, paired design, purposive)

Spatial replication

18

5

Studies lacking details of how many true spatial replicates were sampled

Temporal replication

3

0.9

Studies lacking information of how many samples were taken over time

Soil sampling depth

1

0.3

Studies lacking information on how many soil samples were taken and at what depth

Tillage description

108

31

Studies lacking information on the type and intensity of tillage treatments

Measure of variability

196

56

Studies failing to report a measure of variability around treatment means