Fig. 2

Soil thin sections and monochrome images of the soil microstructure at the Narita farms. Bar 1.0 mm. a Well-developed granular structure in the A1 horizon of N-UF. b Weakly developed granular structure in the A1 horizon of N-CF. The granules have been compressed. c Spongy structure with crumbs in the A2 horizon of N-UF. This structure contains many channels. d Subangular blocky structure with planes and channels in the A2 horizon of N-CF