Comparative Effectiveness of Four Nitrification Inhibitors for Mitigating Carbon Dioxide and Nitrous Oxide Emissions from Three Different Textured Soils

Abstract

Nitrification inhibitors (NIs) can be used to reduce both NO3−-N leaching and N2O-N emissions. However, the comparative efficacies of NIs can be strongly affected by soil type. Therefore, the efficacies of four nitrification inhibitors (dicyandiamide (DCD), 3, 4-dimethylpyrazole phosphate (DMPP), nitrogenous mineral fertilizers containing the DMPP ammonium stabilizer (ENTEC) and active ingredients: 3.00–3.25% 1, 2, 4-triazole and 1.50–1.65% 3-methylpyrazole (PIADIN)) were investigated in three different textured N-fertilized (0.5 g NH4+-N kg−1 soil) soils of Schleswig-Holstein, namely, Marsch (clayey), Östliches Hügelland (loamy) and Geest (sandy) under a controlled environment. Total CO2-C and N2O-N emissions were significantly higher from Marsch than Östliches Hügelland and Geest. In Marsch, DMPP showed the highest inhibitory effect on CO2-C emission (50%), followed by PIADIN (32%) and ENTEC (16%). In Östliches Hügelland, DCD and PIADIN showed the highest and equal inhibitory effect on CO2-C emission (73%), followed by DMPP (64%) and ENTEC (36%). In Marsch and Östliches Hügelland, DCD showed the stronger inhibitory effect on N2O-N emission (86% and 47%) than DMPP (56% and 30%) and PIADIN (54% and 16%). In Geest, DMPP was more effective in reducing N2O-N emission (88%) than PIADIN (70%) and DCD (33%). Thus, it can be concluded that DCD is a better NI for clay and loamy soils, while DMPP and PIADIN are better for sandy soils to inhibit soil nitrification and gaseous emissions.

Comparative Effectiveness of Biogas Residue Acidification and Nitrification Inhibitors in Mitigating CO2 and N2O Emissions from Biogas Residue-Amended Soils

“…Thus, NIs could have inhibited nitrification through suppressing the activity of ammonia-oxidizing bacteria or relevant enzymes, effectively delaying the oxidization process that transforms NH 4 + into NO 3 − . The decrease of CO 2 -C by applied NIs (Guo et al, 2021b) mostly was caused by the inhibition of microbial activities (Wolf et al, 2014). We found long-lasting higher NH 4 + -N concentration and lower CO 2 -C and N 2 O-N emissions from DMPP-treated soil as compared to PIADIN-treated soil (Fig.…”

Reduction of nitrogen losses in agriculture by fertilizer additives: Appeal for more detailed scientific work—Comments on Guo et al. “Efficacy of four nitrification inhibitors for the mitigation of nitrous oxide emissions under different soil temperature and moisture,” Journal of Plant Nutrition and Soil Science (2022), 185(1), 60–68

“…(2022; in part also in Guo et al. [2021]), there are inaccuracies concerning the concept of the tested products, the quantity of the test products, and the applied analysis method. Altogether it resulted in a misleading and inappropriate evaluation of the efficiency of the tested products in particular with respect to practical field conditions.…”

“…In the paper of Guo et al (2022; in part also in Guo et al [2021]), there are inaccuracies concerning the concept of the tested products, the quantity of the test products, and the applied analysis method.…”

Prolonged Flooding followed by drying increase greenhouse gas emissions differently from soils under grassland and arable land uses

“…The CO 2 -C, N 2 O-N, and CH 4 -C emission rates were calculated by measuring the concentration of these gases in the headspace of closed pots at different times. The CO 2 -C, N 2 O-N, and CH 4 -C samples were collected once a day during the first week, once per two days during the second week, and once per three days during the last two weeks (Guo et al, 2021a). The pots were first closed by adding lids, gases were mixed by collecting and injecting the gas in and out of the pots a few times with a syringe, and then samples were collected from the headspace at 0, 30, and 60 min after lid closure (Guo et al, 2021b).…”