Fig. 5.

Characteristic patterns of labile element fluxes and pH in the rhizosphere of lupine grown on calcareous soil with NH₄NO₃ fertilization. Scale bars represent 1 cm. The smaller scale bar corresponds to the photo and the pH image, the larger one to the element images. The imaging areas for the PO are indicated with dotted lines in the photos, the imaging areas for DGT are indicated with dashed lines. PO images were noise corrected (black pixels represent image noise where no pH-value could be assigned)