Loading in 2 Seconds...
Loading in 2 Seconds...
Greenhouse Gas Emissions from Crop Production Systems and Fertilizer Management Effects. C.S. Snyder, T.W. Bruulsema, T.L. Jensen, and P. E. Fixen. Background. N is essential to the survival of all life
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
C.S. Snyder, T.W. Bruulsema, T.L. Jensen, and P. E. Fixen
Dedicated to improved nutrient use effectiveness and reductions in environmental footprints: including GHG emissions
United Nations Educational, Scientific, and Cultural Organization
& Scientific Committee on Problems of the Environment
20% more people in ~ 20 years
Less Developed Regions
Food, fiber, and fuel demands will continue to increase
…… what will the environmental impacts be?
More Developed Regions
Source: United Nations, World Population Prospects: The 2004 Revision (medium scenario), 2005.
Associated with Fertilizer Use
IPNI Review Paper
IPNI Better Crops article, Issue 4 of 2007
Greenhouse Gas Emissions from Cropping Systems and the Influence of Fertilizer Management
GWP = Global Warming Potential
N2O x 296 = CO2 equivalent
CH4 x 21 = CO2 equivalent
Sources: U.S. EPA, IPCC 3rd assessment
< 10% of total U.S. GHG
Recently published reports suggest terrestrial and aquatic N2O-N emissions may range from 3 to 5% of “new N”
(Crutzen et al., 2008. Atmos. Chem. Phys. 8:389-395)
Data source: IFA, AAPFCO & TFI
Improving Nitrogen Use Efficiency for Cereal Production
( 1999 Agronomy Journal 91:357-363)
SPARROW - Modeled Estimate of N and P Discharge in Watersheds of the Mississippi R. Basin
0.1 to 1
1 to 5
5 to 10
Alexander et al., 2008.
Environ. Sci. Technol. 42: 822–830
Indices of Agronomic and Environmental Benefit
post-harvest evaluation of N effectiveness in cropping systems
F-amt. nutrient applied, Y- yield of harvested portion with applied nutrient, Y0- yield of harvested portion with no applied nutrient, UH –nutrient content of harvested portion of crop, U –total nutrient uptake in aboveground biomass with nutrient applied, U0 –total nutrient uptake in aboveground biomass with no nutrient applied
“The Market” Nov.1, 2007
12% increase in N fertilizer use
Since 1975:Corn grain produced in the U.S. per unit of fertilizer N used, 1964 to 2005.
*Application rate for 2004 estimated as avg of 2003 & 2005.
Data sources: USDA Ag Chem Use Survey & Annual Crop Production.
802,682 x 0.01= 8,027 metric tons N2O–N emitted
(assuming IPCC 1% factor)
N x 1.57 = 12,602 metric tons of N2O
N2O x 296 = 3.73 million metric tons GWP CO2 equivalent
All GHGs in CA in 2004 (CA EPA, ARB 2007) :
479.74 million metric tons CO2 equivalent
Portion of total that is “fertilizer N induced”
= (3.73/479.74) x 100 = 0.78% of all GWP in California
Fertilizer N BMPs can help minimize potential for residual NO3-N accumulation & losses
Please Visit the IPNI Website: