Can nitrogen input mapping from aerial imagery improve nitrous oxide emissions estimates from grazed grassland? View Full Text


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Article Info

DATE

2022-06-21

AUTHORS

Juliette Maire, Simon Gibson-Poole, Nicholas Cowan, Dominika Krol, Cathal Somers, Dave S. Reay, Ute Skiba, Robert M. Rees, Gary J. Lanigan, Karl G. Richards

ABSTRACT

Most nitrogen (N) lost to the environment from grazed grassland is produced as a result of N excreted by livestock, released in the form of nitrous oxide (N2O) emissions, nitrate leaching and ammonia volatilisation. In addition to the N fertiliser applied, excreta deposited by grazing livestock constitute a heterogeneous excess of N, creating spatial hotspots of N losses. This study presents a yearlong N2O emissions map from a typical intensively managed temperate grassland, grazed periodically by a dairy herd. The excreta deposition mapping was undertaken using high-resolution RGB images captured with a remotely piloted aircraft system combined with N2O emissions measurements using closed statics chambers. The annual N2O emissions were estimated to be 3.36 ± 0.30 kg N2O–N ha−1 after a total N applied from fertiliser and excreta of 608 ± 40 kg N ha−1 yr−1. Emissions of N2O were 1.9, 3.6 and 4.4 times lower than that estimated using the default IPCC 2019, 2006 or country-specific emission factors, respectively. The spatial distribution and size of excreta deposits was non-uniform, and in each grazing period, an average of 15.1% of the field was covered by urine patches and 1.0% by dung deposits. Some areas of the field repeatedly received urine deposits, accounting for an estimated total of 2410 kg N ha−1. The method reported in this study can provide better estimates of how management practices can mitigate N2O emissions, to develop more efficient selective approaches to fertiliser application, targeted nitrification inhibitor application and improvements in the current N2O inventory estimation. More... »

PAGES

1743-1774

References to SciGraph publications

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  • 2012-04-03. A urine patch framework to simulate nitrogen leaching on New Zealand dairy farms in NUTRIENT CYCLING IN AGROECOSYSTEMS
  • 2020-04-24. Field-scale management and environmental drivers of N2O emissions from pasture-based dairy systems in NUTRIENT CYCLING IN AGROECOSYSTEMS
  • 2019-01-05. Using low-cost geophysical survey to map soil properties and delineate management zones on grazed permanent pastures in PRECISION AGRICULTURE
  • 2012-07-31. The application of small unmanned aerial systems for precision agriculture: a review in PRECISION AGRICULTURE
  • 2009-12-12. Nutrient redistribution by grazing cattle drives patterns of topsoil N and P stocks in a low-input pasture ecosystem in NUTRIENT CYCLING IN AGROECOSYSTEMS
  • 2015-09-04. Variable rate nitrogen fertilizer response in wheat using remote sensing in PRECISION AGRICULTURE
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    51 emission estimates
    52 emission factors
    53 emission measurements
    54 emissions of N2O
    55 environment
    56 estimates
    57 estimation
    58 excess
    59 factors
    60 fertiliser
    61 fertiliser application
    62 field
    63 form
    64 grasslands
    65 grazed grasslands
    66 grazing period
    67 herds
    68 high-resolution RGB images
    69 hotspots
    70 imagery
    71 images
    72 improvement
    73 inhibitor application
    74 input mapping
    75 inventory estimation
    76 leaching
    77 livestock
    78 loss
    79 management practices
    80 mapping
    81 measurements
    82 method
    83 most nitrogen
    84 nitrate leaching
    85 nitrification inhibitor application
    86 nitrogen
    87 nitrous oxide emissions
    88 oxide emissions
    89 patches
    90 period
    91 piloted aircraft systems
    92 practice
    93 results
    94 selective approach
    95 size
    96 spatial distribution
    97 spatial hotspots
    98 static chambers
    99 study
    100 system
    101 temperate grasslands
    102 time
    103 total
    104 urine deposits
    105 urine patches
    106 volatilisation
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