Nonlinear nitrous oxide (N2O) response to nitrogen fertilizer in on‐farm corn crops of the US Midwest

Row‐crop agriculture is a major source of nitrous oxide (N2O) globally, and results from recent field experiments suggest that significant decreases in N2O emissions may be possible by decreasing nitrogen (N) fertilizer inputs without affecting economic return from grain yield. We tested this hypothesis on five commercially farmed fields in Michigan, USA planted with corn in 2007 and 2008. Six rates of N fertilizer (0–225 kg N ha−1) were broadcast and incorporated before planting, as per local practice. Across all sites and years, increases in N2O flux were best described by a nonlinear, exponentially increasing response to increasing N rate. N2O emission factors per unit of N applied ranged from 0.6% to 1.5% and increased with increasing N application across all sites and years, especially at N rates above those required for maximum crop yield. At the two N fertilizer rates above those recommended for maximum economic return (135 kg N ha−1), average N2O fluxes were 43% (18 g N2O–N ha−1 day−1) and 115% (26 g N2O–N ha−1 day−1) higher than were fluxes at the recommended rate, respectively. The maximum return to nitrogen rate of 154 kg N ha−1 yielded an average 8.3 Mg grain ha−1. Our study shows the potential to lower agricultural N2O fluxes within a range of N fertilization that does not affect economic return from grain yield.

[1]  Peter Grace,et al.  Nitrogen fertilizer management for nitrous oxide (N2O) mitigation in intensive corn (Maize) production: an emissions reduction protocol for US Midwest agriculture , 2010 .

[2]  Greg Stewart,et al.  Nitrous oxide fluxes from corn fields: on‐farm assessment of the amount and timing of nitrogen fertilizer , 2010 .

[3]  J. Melillo,et al.  Indirect Emissions from Biofuels: How Important? , 2009, Science.

[4]  G. Robertson,et al.  Nitrogen in Agriculture: Balancing the Cost of an Essential Resource , 2009 .

[5]  A. Ravishankara,et al.  Nitrous Oxide (N2O): The Dominant Ozone-Depleting Substance Emitted in the 21st Century , 2009, Science.

[6]  A. Halvorson,et al.  Nitrogen, tillage, and crop rotation effects on nitrous oxide emissions from irrigated cropping systems. , 2008, Journal of environmental quality.

[7]  C. Wagner-Riddle,et al.  Linking Nitrous Oxide Flux During Spring Thaw to Nitrate Denitrification in the Soil Profile , 2008 .

[8]  P. Rochette,et al.  N2O emissions from spring barley production as influenced by fertilizer nitrogen rate , 2008 .

[9]  R. Betts,et al.  Changes in Atmospheric Constituents and in Radiative Forcing. Chapter 2 , 2007 .

[10]  S. Solomon.  The Physical Science Basis : Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[11]  Pete Smith,et al.  'Agriculture', in Climate change 2007: mitigation , 2007 .

[12]  G. Robertson,et al.  New approaches to environmental management research at landscape and watershed scales , 2007 .

[13]  Pushpam Kumar.  Agriculture (Chapter8) in IPCC, 2007: Climate change 2007: Mitigation of Climate Change. Contribution of Working Group III to the Fourth assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[14]  E. Stehfest,et al.  N2O and NO emission from agricultural fields and soils under natural vegetation: summarizing available measurement data and modeling of global annual emissions , 2006, Nutrient Cycling in Agroecosystems.

[15]  Rafael S.A. Novoa,et al.  Evaluation of the N2O emissions from N in plant residues as affected by environmental and management factors , 2006, Nutrient Cycling in Agroecosystems.

[16]  John E. Sawyer,et al.  Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn , 2006 .

[17]  E. Pattey,et al.  Modeling the Effects of Fertilizer Application Rate on Nitrous Oxide Emissions , 2006 .

[18]  G. Robertson,et al.  Nonlinear response of N2O flux to incremental fertilizer addition in a continuous maize (Zea mays L.) cropping system , 2005 .

[19]  R. Gehl,et al.  Corn Yield Response to Nitrogen Rate and Timing in Sandy Irrigated Soils , 2005 .

[20]  Z. Zhu,et al.  Nitrogen fertilizer use in China – Contributions to food production, impacts on the environment and best management strategies , 2002, Nutrient Cycling in Agroecosystems.

[21]  C. Wagner-Riddle,et al.  Nitrous oxide emissions from agricultural fields during winter and spring thaw as affected by management practices , 1998, Nutrient Cycling in Agroecosystems.

[22]  A. Bouwman.  Direct emission of nitrous oxide from agricultural soils , 1996, Nutrient Cycling in Agroecosystems.

[23]  G. Robertson,et al.  Abatement of nitrous oxide, methane, and the other non-CO2 greenhouse gases: the need for a systems approach. , 2004 .

[24]  J. Munch,et al.  Nitrous oxide fluxes from maize fields: relationship to yield, site-specific fertilization, and soil conditions , 2003 .

[25]  Niels H. Batjes,et al.  Emissions of N2O and NO from fertilized fields: Summary of available measurement data , 2002 .

[26]  N. Batjes,et al.  Modeling global annual N2O and NO emissions from fertilized fields , 2002 .

[27]  J. Bruinsma.  World Agriculture: Towards 2015/2030: An Fao Perspective , 2002 .

[28]  E. Dlugokencky,et al.  Atmospheric chemistry and greenhouse gases , 2001 .

[29]  N. Bertrand,et al.  Winter fluxes of greenhouse gases from snow‐covered agricultural soil:intra‐annual and interannual variations , 2000 .

[30]  Jiabao Zhang,et al.  Agricultural diffuse pollution from fertilisers and pesticides in China , 1999 .

[31]  G. Robertson,et al.  Soil CO2, N2O, and CH4 Exchange , 1999 .

[32]  D. Schimel,et al.  Atmospheric Chemistry and Greenhouse Gases , 1999 .

[33]  M. Chantigny,et al.  Nitrous oxide production in soils cropped to corn with varying N fertilization , 1998 .

[34]  E. Justes,et al.  Nitrous oxide emissions under different soil and land management conditions , 1998, Biology and Fertility of Soils.

[35]  S. Dakota.  Recommended Chemical Soil Test Procedures for the North Central Region , 1998 .

[36]  Wei Zhang,et al.  Nitrate pollution of groundwater in northern China , 1996 .

[37]  M. Vitosh,et al.  Tri-state fertilizer recommendations for corn, soybeans, wheat and alfalfa , 1995 .

[38]  S. Palaniappan,et al.  Nitrate pollution in groundwater. , 1995 .

[39]  Patrice Loisel,et al.  Effect of Parameter Estimation on Fertilizer Optimization , 1994 .

[40]  J. S. Schepers,et al.  Predicting N fertilizer needs for corn in humid regions: using chlorophyll meters , 1992 .

[41]  N. Nagelkerke,et al.  A note on a general definition of the coefficient of determination , 1991 .

[42]  L. Magee,et al.  R 2 Measures Based on Wald and Likelihood Ratio Joint Significance Tests , 1990 .

[43]  M. Eichner,et al.  Nitrous oxide emissions from fertilized soils: summary of available data. , 1990 .

[44]  Gregory Wayne Roth,et al.  Soil and tissue nitrate tests compared for predicting soil nitrogen availability to corn , 1989 .

[45]  D. A. Storer.  A simple high sample volume ashing procedure for determination of soil organic matter , 1984 .

[46]  D. Keeney,et al.  Nitrogen Management for Maximum Efficiency and Minimum Pollution , 1982 .

[47]  F. W. Chichester.  Effects of Increased Fertilizer Rates on Nitrogen Content of Runoff and Percolate From Monolith Lysimeters 1 , 1977 .

[48]  G. Stanford,et al.  Rationale for Optimum Nitrogen Fertilization in Corn Production , 1973 .