Greenhouse gas emissions from corn-based cropland management: the - - PowerPoint PPT Presentation

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Oct 19, 2022 369 likes •523 views

Greenhouse gas emissions from corn-based cropland management: the Sustainable Corn CAP Approach Mike Castellano Frankenberger Professor of Soil Science Associate Professor, Department of Agronomy castelmj@iastate.edu 515-294-3963 N 2 O from

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Greenhouse gas emissions from corn-based cropland management: the Sustainable Corn CAP Approach

Mike Castellano Frankenberger Professor of Soil Science Associate Professor, Department of Agronomy castelmj@iastate.edu 515-294-3963

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N2O from Agricultural Soil Management ~51%

CH4 from Enteric Fermentation ~32% CH4 from Manure Management ~12% N2O from Manure Mgt. ~3% CH4 from Rice Cultivation ~2% U.S. Agriculture Sector GHG on a CO2 Eq. basis; EPA 2013 As a sector, agriculture accounts for ~8% of U.S. GHG on a CO2 Eq. basis

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Mitigation: Global Technical Potential

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Mitigation: Global Economic Potential

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Mitigation: Global Economic Potential

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Measuring CO2, CH4 and N2O

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Gas Chromatography Photoacoustic Spectroscopy

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Developing the methodology:

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Matt Liebman, Wallace Chair for Sustainable Agriculture

Marsden Farm

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Corn N2O Emissions

kg N ha-1 (to corn only)

135 225

2 4 6 8

No Rye Cover Crop Rye Cover Crop

Soybean N2O Emissions

135 225

2011 kg N2O-N emitted ha-1 kg N ha-1 (to corn only) 0 = insufficient 135 = agronomic optimum 225 = excessive

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Cropland management is an economical

source of GHG (N2O) mitigation.

Nitrous oxide emissions highly variable in

space and time – need more methods that are easily adopted.

Nitrogen fertilizer management can play a

significant role in N2O emissions mitigation.

Mike Castellano 515-294-3963 castelmj@iastate.edu