Fig. 4. Time series data of the average NO₃ concentrations observed from the undisturbed-profile lysimeters fitted with Eq. [1]. Nitrate concentrations increase in Phase 1, decrease in Phase 2, and reach and maintain a steady value in Phase 3. Also included are concentrations calculated from the soil N test values from 0 to 1.8 m along with one standard deviation error bars.

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