Revisiting the Effectiveness of Nitrification Inhibitors Under Different Soil Moisture Conditions and Mineral Nitrogen Extraction Methods: Further Experimental Work Considering the Pasda et al. (2023) Opinion Paper

Background

In a recent opinion article, Pasda et al. indicated that the findings from our previous study (Guo et al.) were misleading due to the inappropriateness of the experimental work. The mentioned study focused on the effectiveness of four nitrification inhibitors (NIs) in reducing nitrous oxide (N2O) emissions as affected by temperature and moisture.

Aims

We assessed to what extent the issues raised by Pasda et al. impact the findings presented by Guo et al. The points considered were (i) the lack of distinction between pure NIs, commercial formulations, and NI-treated fertilizers, (ii) unsuitable application rates of nitrogen (N) and NIs, and (iii) inappropriate soil NH4+-N extraction method.

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Results

The control treatments at the both 60% and 80% WHC exhibited highest N2O-N emissions; however, emissions were higher at 80% WHC compared to 60%. NIs effectively reduced N2O emissions although the efficiency was slightly lower 80% WHC. Furthermore, NI treatments also retained higher NH4+-N levels and suppressed NO3-N accumulation. KCl extractions consistently yielded higher amount of NH4+-N as compared to CaCl2.

Conclusions

The study proves that the dilution of ENTEC significantly affected Guo et al.’s results. In the current study, ENTEC effectively reduced N2O emissions, performing similar to DMPP, DCD, and PIADIN. The high efficiency of these inhibitors remains consistent and in line with the earlier findings. Although the KCl extraction is more precise for NH4+-N measurement, CaCl2 can still detect NI effects and may be suitable depending on the specific context of study.

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