Fig. 15From: How does tillage intensity affect soil organic carbon? A systematic reviewBoxplot of difference in SOC concentration for NT–HT at 0–15 cm as affected by HT depth. NT no tillage, HT high intensity tillage (see text for explanation). Thick line, median; boxes, interquartile ranges (Q1–Q3); whiskers, non-outlier range; points, outliersBack to article page