The Carbon Farming Initiative and Agricultural Emissions

This presentation was prepared by the University of Melbourne for the Regional Landcare Facilitator training

funded through the Australian Government’s Carbon Farming Initiative Communications Program

This presentation provides options to reduce methane and nitrous oxide emissions from agricultural systems

PART 8: OPTIONS FOR ABATEMENT – EMISSION REDUCTION

Animal Manipulation

Rumen Manipulation

Diet Manipulation

Plant Breeding

DietarySupplements

Dietary Oils

Probiotics

Management Systems

Forage quality

Alternative livestock systems

Animal Breeding

Biological Control

Vaccination

Bacteriophages bacteriocins

Chemical Defaunation

Reductive Acetogenesis

Enzymes

Plant Secondary Compounds

Tannin & Saponin

Technologies to ReduceEnteric Methane Emissions

Dicarboxylic acids

Unproductive Animals

Residual Feed Intake

Efficiency

Eckard 2008

Options for abatement - Methane

051015202530354045

Low Medium High

DietarySupplements

Breeding

Vaccination

“Silver bullet”

Rumen manipulation

Immediate Longer Term

Herd Management

Biological control

Likely ImpactTimeline

High LowConfidence

Eckard, Grainger & de Klein 2010

• Measurement – in vitro– Test tubes – Continuous Culture

AgResearch, New Zealand

• Measurement– SF6 (sulphur hexafluoride)Tracer

• Individual animals in the field

Permeation tubes

Grainger, Eckard et al. 2007

Evacuated yolk/canister

• Measurement– Chambers/Calorimeters

• Individual Animals

Grainger, Eckard et al. 2007

• Measurement– Open Path laser or FTIR tracer

Reflector

Griffiths et al. 2007; Phillips et al. 2009

Laser FTIR

• Short term– Feed quality

• Pasture improvement• C3 pastures, legumes

– Dietary supplements• Grain• Tannins• Oils

– 1% fat = 3.5% decrease CH4 /kg DMI

Eckard et al. 2010; Moate et al. 2010

• Short term– Improving farm efficiency / animal numbers

• Extended lactation• Earlier finishing of beef• Reproduction, weaning percentages, fertility &

health– Alternative livestock systems

• Monogastrics & kangaroos?– Pigs & chooks cannot covert grass into food

Eckard et al. 2010

• Medium Term– Animal Breeding

• Feed conversion efficiency• Reduced methanogenesis

– Plant Breeding• Improved energy to protein ratio• Tannin, oils, sugars

• Longer-term– Rumen manipulation/ biological control

• Vaccination • Competitive or predatory microbes • Acetogenesis (Kangaroo)• Succinate (Tamar Wallaby)

Technologies to reduceNitrous Oxide emissions

Animal Soils

ChemicalIntgerventions

Waterlogging / drainage

Physical interventions

Dietary Interventions

Nitrification inhibitor in urine

Balancing Protein: Energy

Irrigation

Compaction

Restricted Grazing

Source

Timing

Breeding

Feed Conversion Efficiency

Controlled Release

Plant breeding eg. tannins

Fertiliser

Nitrification Inhibitors

Effluent Management

Eckard 2008

Options for abatement – N2O

Low Medium High

NitrificationInhibitors

PlantBreeding

“Silver bullet”

Animal Breeding Soil Microbial

Manipulation

Secondary plantcompounds

De Klein & Eckard 2008

Herd Management

Biological control

Immediate Longer TermTimelineHigh LowConfidence

Likely Impact

• Measurement of N2O– Manual and automatic chambers

• Measurement of N2O– Micrometeorological methods

• Short term - Nitrogen Fertiliser Rate• Match to plant demand• Similar with effluent

0123456789

101112131415

0 100 200 300 400 500 600 700 800 900

Annual N Fertiliser Rate (kg N/ha.y)

UreaNitrate

11.7 8.1

6.08.5

0 100 200 300 400 500 600

Nitrogen Fertiliser Rate (kg N/ha.y)

a.y) Urea

Nitrate

Productivity Environment

Eckard et al. 2006

0 100 200 300N rate

ha) Cotton

Wheat-Vetch-CottonWheat-Cotton

• Short term - Nitrogen fertiliser rate

Grace et al. 2007

• Short term - Choice of N Source• In wet soils

– N2O (nitrous oxide) from NO3-N (nitrate) source– Denitrification or leaching

• In dry soils – N2O (nitrous oxide) from NH3 (ammonia)– Volatilisation from urea

– N Placement• Band, ridges• Within paddock

0 100 200 300 400 500 600

Nitrogen Fertiliser Rate (kg N/ha.y)

a.y) Urea

Nitrate

Eckard et al. 2006

Autumn Winter Spring Summer

a)Control Ammonium nitrate Urea

• Short term - N Source and timing

Eckard et al. 2002

• Short term - Fertiliser formulation– Urease inhibitors

• Reduces NH3 (ammonia) volatilisation– eg. Agrotain®, Green UreaTM

– Nitrification inhibitors• Reduces N2O (nitrous oxide) and

NO3 (nitrate) leaching• Temperature sensitive

– eg. DCD, Nitrapyrin, DMPP

ENTEC®

• Short term - N formulation– Nitrification Inhibitor sprays on pasture

• 50% less N2O – for 50 days mid-spring

• 25% less N2O – for 25 days in summer

Kelly et al;. 2008

• Short term - N formulation– Controlled Release/Coated Fertilisers

• Polymer or oil-based coating– Controlled pattern/rate of release

– Slow Release Fertilisers• Reduced solubility

– Chemical– Physical mixing

• Slower release of N

• Short term – Soil Water / irrigation

Granli and Bøckman (1994)

• Short term - Soil Management– Limited grazing on wet soils/ use of feedpads– Soil structure

• Reduce waterlogging with N• Reduce soil compaction with N

– Stubble management• Retain stubble• Conservation tillage and controlled traffic • Build soil organic matter

– Reduce fallow• Loss of unutilised N• Cover crops

• Medium term– Plant breeding

• Tannin content• Less N required

– Animal breeding• More N efficient

• Longer term– Rumen manipulation– Soil microbial manipulation

Low Medium High

NitrificationInhibitors

PlantBreeding

“Silver bullet”

Animal Breeding Soil Microbial

Manipulation

Secondary plantcompounds

Herd Management

Biological control

Immediate Longer TermTimelineHigh LowConfidence

Likely Impact

• Short Term – Balancing ME:CP– Feed tannins– Animal numbers

• Reduce hot-spots– Inhibitors

• Inhibitor spray

• Longer Term– Breeding

• Improve animal FCE• Improve plant

– ME:CP– tannins

• Urine Management• Ruminants excrete 75 to 95% of N intake

Grainger et al. 2009; De Klein & Eckard 2008

The Carbon Farming Initiative and Agricultural Emissions

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