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Fig. 2 | BMC Biology

Fig. 2

From: Effects of phosphorus-solubilizing bacteria and biochar application on phosphorus availability and tomato growth under phosphorus stress

Fig. 2

Extracellular organic acids under soluble and insoluble phosphorus conditions. A HPLC chromatograms depict organic acids under insoluble phosphorus (Ca3(PO4)2) condition. Arrows indicate the peak position of detected organic acids and molecular formulas are marked. B Types and concentrations of organic acids under insoluble phosphorus condition. Pie charts illustrate the proportion of each organic acid, while bar charts below show the concentration of organic acids. C HPLC chromatograms depict organic acids under soluble phosphorus (KH2PO4) condition. Arrows indicate the peak position of detected organic acids and molecular formulas are marked. D Types and concentrations of organic acids under soluble phosphorus condition. Pie charts illustrate the proportion of each organic acid, while bar charts below show the concentration of organic acids

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