Impact of nitrification inhibitor (DMPP) on soil nitrous oxide emissions from an intensive broccoli production system in sub-tropical Australia

Scheer, Clemens; Rowlings, David; Firrel, Mary; Deuter, Peter; Morris, Stephen; Grace, Peter R.

doi:10.1016/j.soilbio.2014.07.006

Cited by 110 publications

(64 citation statements)

References 24 publications

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“…Our results were consistent with those from other studies using DMPP on similar soil types in this region (De Antoni Migliorati et al 2014;Scheer et al 2014Scheer et al , 2016a and from other climates and production systems (Pasda et al 2001;Chaves et al 2006;Benckiser et al 2013). All have consistently reported effective nitrification inhibition periods of 60-90 days.…”

Section: Effects Of Dmpp On N 2 O Emissions and Grain Yieldssupporting

confidence: 92%

Comparison of grain yields and N2O emissions on Oxisol and Vertisol soils in response to fertiliser N applied as urea or urea coated with the nitrification inhibitor 3,4-dimethylpyrazole phosphate

Migliorati

Bell

Lester³

et al. 2016

Soil Res.

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Abstract. The potential for elevated nitrous oxide (N 2 O) losses is high in subtropical cereal cropping systems in northeast Australia, where the fertiliser nitrogen (N) input is one single application at or before planting. The use of urea coated with the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) has been reported to substantially decrease N 2 O emissions and increase crop yields in humid, high-intensity rainfall environments. However, it is still uncertain whether this product is similarly effective in contrasting soil types in the cropping region of north-east Australia. In this study the grain yield response of sorghum (Sorghum bicolor L. Moench) to rates of fertiliser N applied as urea or urea coated with DMPP were compared in crops grown on a Vertisol and an Oxisol in southern Queensland. Seasonal N 2 O emissions were monitored on selected treatments for the duration of the cropping season and the early stages of a subsequent fallow period using a fully automated high-frequency greenhouse gas measuring system. On each soil the tested treatments included an unfertilised control (0 kg N ha -1 ) and two fertilised treatments chosen on the basis of delivering at least 90% of seasonal potential grain yield (160 and 120 kg N ha -1 on the Vertisol and Oxisol respectively) or at a common (suboptimal) rate at each site (80 kg N ha -1 ). During this study DMPP had a similar impact at both sites, clearly inhibiting nitrification for up to 8 weeks after fertiliser application. Despite the relatively dry seasonal conditions during most of the monitoring period, DMPP was effective in abating N 2 O emissions on both soils and on average reduced seasonal N 2 O emissions by 60% compared with conventional urea at fertiliser N rates equivalent to those producing 90% of site maximum grain yield. The significant abatement of N 2 O emissions observed with DMPP, however, did not translate into significant yield gains or improvements in agronomic efficiencies of fertiliser N use. These results may be due to the relatively dry growing season conditions before the bulk of crop N acquisition, which limited the exposure of fertiliser N to large losses due to leaching and denitrification.

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Section: Effects Of Dmpp On N 2 O Emissions and Grain Yieldssupporting

confidence: 92%

Comparison of grain yields and N2O emissions on Oxisol and Vertisol soils in response to fertiliser N applied as urea or urea coated with the nitrification inhibitor 3,4-dimethylpyrazole phosphate

Migliorati

Bell

Lester³

et al. 2016

Soil Res.

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“…The less important role of soil NH 4 + and NO 3 -contents in the regulation of N 2 O production in this soil could also have contributed to the ineffectiveness of NICU to mitigate N 2 O emissions. The capacity of NICU to abate N 2 O emissions has been proven in numerous studies, with decreases in N 2 O emissions between 37-77% in various cropping systems (Liu et al 2013;De Antoni Migliorati et al 2014;Scheer et al 2014;Lam et al 2015). A field study on a sugarcane farm in Central Queensland, Australia showed that DMPP-coated urea decreased post-fertilisation N 2 O emissions by~44% (Wang et al 2012), while a decrease of~38% in N 2 O emissions from the fertilised area was recorded in another Australian sugarcane cropping system .…”

Section: Efficacy Of Nitrification Inhibitor-coated Ureamentioning

confidence: 99%

Nitrous oxide emission and fertiliser nitrogen efficiency in a tropical sugarcane cropping system applied with different formulations of urea

et al. 2016

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Abstract. Nitrous oxide (N 2 O) emissions from sugarcane cropped soils are usually high compared with those from other arable lands. Nitrogen-efficient management strategies are needed to mitigate N 2 O emissions from sugarcane farming whilst maintaining productivity and profitability. A year-long field experiment was conducted in wet tropical Australia to assess the efficacy of polymer-coated urea (PCU) and nitrification inhibitor (3,4-dimethylpyrazole phosphate)-coated urea (NICU). Emissions of N 2 O were measured using manual and automatic gas sampling chambers in combination. The nitrogen (N) release from PCU continued for >5-6 months, and lower soil NO 3 -contents were recorded for !3 months in the NICU treatments compared with the conventional urea treatments. The annual cumulative N 2 O emissions were high, amounting to 11.4-18.2 kg N 2 O-N ha -1 . In contrast to findings in most other cropping systems, there were no significant differences in annual N 2 O emissions between treatments with different urea formulations and application rates (0, 100 and 140 kg N ha -1 ). Daily variation in N 2 O emissions at this site was driven predominantly by rainfall. Urea formulations did not significantly affect sugarcane or sugar yield at the same N application rate. Decreasing fertiliser application rate from the recommended 140 kg N ha -1 to 100 kg N ha -1 led to a decrease in sugar yield by 1.3 t ha -1 and 2.2 t ha -1 for the conventional urea and PCU treatments, respectively, but no yield loss occurred for the NICU treatment. Crop N uptake also declined at the reduced N application rate with conventional urea, but not with the PCU and NICU. These results demonstrated that substituting NICU for conventional urea may substantially decrease fertiliser N application from the normal recommended rates whilst causing no yield loss or N deficiency to the crop. Further studies are required to investigate the optimal integrated fertiliser management strategies for sugarcane production, particularly choice of products and application time and rates, in relation to site and seasonal conditions.

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“…The N 2 O emissions were calculated from the linear increase of the gas concentration at each sampling time (0, 30 and 60 min during the time of chamber closure), adjusted for area and volume of the chamber and corrected for chamber temperature and air pressure as described by Scheer et al (2014). The coefficient of determination (R 2 ) for the linear regression was calculated and used as a quality check for the measurement.…”

Section: Statistical Analysis and Calculationsmentioning

confidence: 99%

Non-linear response of soil N2O emissions to nitrogen fertiliser in a cotton–fallow rotation in sub-tropical Australia

2016

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Abstract. Nitrogen (N) fertiliser is a major source of atmospheric nitrous oxide (N 2 O), and over recent years there has been growing evidence for a non-linear, exponential relationship between N fertiliser application rate and N 2 O emissions. However, there is still a high level of uncertainty around the relationship of N fertiliser rate and N 2 O emissions for many cropping systems. We conducted year-round measurements of N 2 O emission and lint yield in four N-rate treatments (0, 90, 180 and 270 kg N ha -1 ) in a cotton-fallow rotation on a black vertosol in Australia. We observed a non-linear exponential response of N 2 O emissions to increasing N fertiliser rates with cumulative annual N 2 O emissions of 0.55, 0.67, 1.07 and 1.89 kg N ha -1 for the four respective N fertiliser rates, but no N response to yield occurred above 180 kg N ha -1 . The annual N 2 O emission factors induced by N fertiliser were 0.13, 0.29 and 0.50% for the 90, 180 and 270 kg N ha -1 treatments respectively, significantly lower than the IPCC Tier 1 default value of 1.0%. This nonlinear response suggests that an exponential N 2 O emissions model may be more appropriate for estimating emission of N 2 O from soils cultivated to cotton in Australia. It also demonstrates that improved agricultural N-management practices can be adopted in cotton to substantially reduce N 2 O emissions without affecting yield.

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Impact of nitrification inhibitor (DMPP) on soil nitrous oxide emissions from an intensive broccoli production system in sub-tropical Australia

Cited by 110 publications

References 24 publications

Comparison of grain yields and N2O emissions on Oxisol and Vertisol soils in response to fertiliser N applied as urea or urea coated with the nitrification inhibitor 3,4-dimethylpyrazole phosphate

Comparison of grain yields and N2O emissions on Oxisol and Vertisol soils in response to fertiliser N applied as urea or urea coated with the nitrification inhibitor 3,4-dimethylpyrazole phosphate

Nitrous oxide emission and fertiliser nitrogen efficiency in a tropical sugarcane cropping system applied with different formulations of urea

Non-linear response of soil N2O emissions to nitrogen fertiliser in a cotton–fallow rotation in sub-tropical Australia

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