Application of coated nitrate fertilizers is expected to be a possible strategy to reduce nitrous oxide (N₂O) emissions from soils of croplands. To evaluate the effects of coated nitrate fertilizer application on N₂O emissions from soils, N₂O fluxes were measured in a carrot field from 2016 to 2017. Ammonium sulfate (AS), coated urea (CU; only in 2017), coated calcium nitrate (CC), and no-nitrogen (NN) fertilizers were investigated. No recognizable increase in N₂O flux was observed for about 45 days after fertilization in all the plots in 2016. In 2017, significant simultaneous increases in N₂O and nitric oxide fluxes (up to 142 and 436 µg N m⁻² h⁻¹, respectively) were found only in the AS plots in spring, indicating enhancement of N₂O production via nitrification. After mid-July, the N₂O fluxes increased temporarily with the increase in soil water content after rainfall in all the plots including the NN plots in 2016 (up to 183–342 µg N m⁻² h⁻¹) and 2017 (up to 56–86 µg N m⁻² h⁻¹), indicating N₂O production mainly via denitrification. Cumulative N₂O emissions did not differ significantly among all the treatments in 2016, whereas that in the CC plots was significantly lower than that in the AS plots by 36% in 2017. These results suggest that the application of coated calcium nitrate fertilizers can reduce emissions of N₂O produced via nitrification and can thus reduce cumulative N₂O emissions in fields where nitrification is the major N₂O production process in the soil.

预计使用包膜硝酸盐肥料将是减少农田土壤中一氧化二氮（N ₂ O）排放的一种可能策略。为了评估施用硝酸盐肥料对土壤中N ₂ O排放的影响，在2016年至2017年的胡萝卜田中测量了N ₂ O通量。硫酸铵（AS），包覆尿素（CU；仅在2017年），包覆钙研究了硝酸盐（CC）和无氮（NN）肥料。在N无识别增加₂中观察到O排放通量为约45天，在2016年的所有情节受精在2017年以后，在N-显著同时增大₂ O和一氧化氮通量（高达142和436微克n×m个^-2  ħ ^{- 1个}分别在春季的AS地块中发现，表明通过硝化作用提高了N ₂ O的产生。7月中旬之后，2016年（最多183-342 µg N m ^-2  h ^-1）和2017年（最多NN）的所有样地（包括NN样地）中，N ₂ O通量随降雨后土壤含水量的增加而暂时增加。到56-86微克n×m个^-2  ħ ^-1），表明ñ ₂ ö生产主要通过反硝化。累积氮₂2016年所有处理之间的O排放没有显着差异，而CC田的O排放量在2017年显着低于AS田的O排放量，降低了36％。这些结果表明，使用包膜硝酸钙肥料可以减少氮的排放。通过硝化作用产生的₂ O，因此可以减少在硝化作用是土壤中主要N ₂ O生产过程的田地中累积的N ₂ O排放。