Judges’ Queries and Presenter’s Replies

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Presentation Discussion

  • Icon for: Jenny Knoth

    Jenny Knoth

    May 23, 2012 | 01:59 a.m.

    This is needed work. I suspect the soil types and associated microbial communities will influence the NOx emmissions – how are you dealing with these variables in the LCA?

  • Icon for: Ashley Hammac

    Ashley Hammac

    May 24, 2012 | 12:23 p.m.

    Our LCA calculations only consider greenhouse gases so no NOx. Current work is being done in the Pacific Northwest to include other pollutants in biodiesel LCA but I’m not sure if NOx is one being considered.

  • Icon for: Tabitha Brown

    Tabitha Brown

    May 24, 2012 | 11:47 a.m.

    Interesting research and well designed poster. Could you clarify that the emissions in Table 1 are for a 20 year period. I would like to put the emissions on an annual basis to compare to numbers that I have seen in the literature for cereal based cropping systems under different management.

  • Icon for: Ashley Hammac

    Ashley Hammac

    May 24, 2012 | 12:22 p.m.

    Table 1 reflects calculations for annual emissions. Figure 2 represents annual numbers accumulated over 20 years.

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Icon for: Ashley Hammac


Washington State University
Years in Grad School: 3

The Impact of Nitrogen Use Efficiency on Greenhouse Gas Emission in Canola Biodiesel Feedstock Production

The Environmental Protection Agency (EPA) mandated through the second renewable fuel standard (RFS2) that biodiesel meet a minimum threshold requirement (50% reduction) for greenhouse gas (GHG) emission reduction compared to fossil diesel in order to receive monetary incentives for biodiesel feedstock growers (Biomass Crop Assistance Program) and biodiesel processors (Renewable Identification Numbers). A national assessment (LCA) was performed for canola (Brassica napus) biodiesel by EPA and it did meet the minimum threshold requirement. However, while the LCA does consider regional estimates for GHG emission, the estimate of uncertainty associated with canola’s GHG reduction does not reflect variability in feedstock production related soil nitrous oxide emissions due to production region. The authors propose for full GHG reduction potential of biofuels to be realized, LCA results must have regional specificity and should inform regional incentives for growers and processors. The objectives of this work were to determine (1) the impact of NUE on GHG emission from Pacific Northwest canola (2) the impact of nitrous oxide emission estimates for three canola production zones in eastern WA on GHG emission and (3) how canola production regions in Washington State compare to national averages for GHG mitigation. Results from this research may highlight the need for regional assessment/incentive based strategies for maximizing GHG mitigation potential of biofuel feedstocks.