Ammonium N in Overlying Water As can be seen from Figure 3 , the ammonium N (NH 4 + -N) concentration was significantly ( p < 0.05) higher in the N-applied treatments than in the control treatment in the overlying water and showed an overall increasing trend followed by a decreasing trend thereafter.
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Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs.
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pH The pH of the overlying water showed an overall trend, first increasing and then decreasing.
The NO 3 − -N concentration of each treatment had no significant change in SF1 and showed a trend of first increasing and then decreasing ( Figure 4 b).