Fig. 30
From: How does tillage intensity affect soil organic carbon? A systematic review
Boxplots of difference in SOC concentration for IT–HT at 0–15 cm as affected by soil class. IT depth categories shown are: a deep, b shallow, and c not stated. IT intermediate intensity tillage, HT high intensity tillage (see text for explanation). Point size represents study weighting in the analysis (inverse variance). See text for explanation of tillage groups and soil classes (USDA classification). Thick line, median; boxes, interquartile ranges (Q1–Q3); whiskers, non-outlier range; points, outliers