Variations in nitrous oxide emissions as manipulated by plastic film mulching and fertilization over three successive years in a hot pepper-radish rotated vegetable production system

•3-yrs N2O emissions were examined in a hot pepper‒radish rotation field.•FM inconsiderably reduced N2O emission & yield-scaled emission in hot pepper season.•FM significantly increased N2O emission and yield-scaled emissions in radish season.•No remarkable effects of FM on EFs of N2O or yields of both hot pepper and radish.•Substantial differences in N2O emissions displayed between years & vegetable crops.