Floodwater pH (A), volatilization of fertilizer NH3 (B), and emission of fertilizer
N2 (C) in the CF and AWD treatment. Floodwater pH was averaged for the morning and
afternoon measurements. Mean standard error of the mean are shown for pH and N2
emission (n ¼ 4) and for NH3 volatilization (n ¼ 2). R indicates re-flooding of the AWD
soil and dotted lines indicate N fertilization events.
and 15N content using the same process as for soil (see above). Plant
agronomic indices (Guindo et al., 1994) were calculated as follows: