Fig. 3. Calibration relations for different soil layers and the two dyes, brilliant sulfaflavine and sulforhodamine B: total dye concentration in the calibration sample, C_t, is plotted vs. the noncorrected fluorescence signal A_ff, and vs. the fluorescence signal corrected for variations in light reflection at the soil surface by Eq. [5] A_ffr, and by Eq. [7] A_ffr.

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