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Real time monitoring of nitrate in soils as a key for optimization of agricultural productivity and prevention of groundwater pollution

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Figure

Figure 1. Absorption spectra of nitrate at concentrations of 25,1000, and 5 ppm dissolved organic carbon (DOC).
Figure 2. Soil-packed column and optical setup for nitrate break-through curve experiment.
Figure 3. Nitrate concentration vs. absorbance at various wavelengths. Right ordinate presents nitrate concentration for the citrus orchardonly.
Figure 4. Absorbance in the 300 nm region of samples taken under the organic greenhouse
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