Results NO 3 – -N, NH 4 + -N concentrations In the (NH 4 ) 2 SO 4 control of the calcareous soil, the NO 3 – -N concentrations showed an increasing trend from 19.7 mg kg -1 soil to 189.6 mg kg -1 at day 14 ( Figure 1A ).
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Syringic acid from rice roots inhibits soil nitrification and N<sub>2</sub>O emission under red and paddy soils but not a calcareous soil.
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