Fig. 3. ¹⁵N atom excess values (%) of soil inorganic N (NO^-₃ and NH⁺₄), soil microbial N and total soil N, 1997 to 1999 (0- to 15-cm depth). Least-squares means, standard errors (N = 48, average of all treatments). Zero ¹⁵N atom excess (%) represent natural abundance measured in adjacent main plots. All treatments were flooded during the cropping season while only the winter flooded treatments were flooded during the winter fallow period.

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