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Fig. 3. Nitrogen fertilization strategies and concentrations of nitrate (NO₃)–N in soil depths of 0 to 30, 30 to 60, 60 to 90, and 0 to 90 cm during the 4 experimental yr. No N, Con. N, and Opt. N represent no N fertilization, conventional N fertilization and optimized N fertilization treatment, respectively.

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