Fig. 23From: How does tillage intensity affect soil organic carbon? A systematic reviewBoxplot of difference in SOC concentration for NT–HT at > 30 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